Manually Add Network in MetaMask

Sometimes the MetaMask won't let you change the network settings like the Ethereum Mainnet. In this case you can add a new Ethereum Mainnet.
Follow the same steps to the Settings
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And go to the tab of Network.
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Add a new one.
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MetaMask will open a new webpage for users to input information about the new chain. 
Click Add a network manually 
Input network name, RPC URL, Chain ID and Currency Symbol and click 'Save'. It is ready to go. 
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Ethereum
Klaytn
Polygon
Arbitrum
OP
BSC
Avalanche
zkSync Era
Specs
Network
Network Name: BlockPI Ethereum Mainnet
Chain ID: 1
New RPC URL: https://ethereum.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://etherscan.io/​
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Mainnet
Network Name: BlockPI Ethereum Georli
Chain ID: 5
New RPC URL: https://goerli.blockpi.network/v1/rpc/<your key>
Currency symbol: GETH
Block Explorer: https://goerli.etherscan.io/
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Georli
Network Name: BlockPI Ethereum Sepolia
Chain ID: 11155111
New RPC URL: https://ethereum-sepolia.blockpi.network/v1/rpc/<your key>
Currency symbol: SepoliaETH
Block Explorer: https://sepolia.etherscan.io/​
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Sepolia
Specs
Network
Network Name: BlockPI Klaytn Mainnet-Cypress
Chain ID: 8217
New RPC URL: https://klaytn.blockpi.network/v1/rpc/<your key>
Currency symbol: KLAY
Block Explorer: https://scope.klaytn.com​
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Mainnet
Network Name: BlockPI Klaytn Testnet-Baobabs
Chain ID: 1001
New RPC URL: https://klaytn-baobab.blockpi.network/v1/rpc/<your key>
Currency symbol: KLAY
Block Explorer: https://baobab.scope.klaytn.com​
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Baobab
Specs
Network
Network Name: BlockPI Polygon Mainnet
Chain ID: 137
New RPC URL: https://polygon.blockpi.network/v1/rpc/<your key>
Currency symbol: MATIC
Block Explorer: https://polygonscan.com/​
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Mainnet
Network Name: BlockPI Polygon Mumbai
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Chain ID: 80001
New RPC URL: https://polygon-mumbai.blockpi.network/v1/rpc/<your key>
Currency symbol: MATIC
Block Explorer: https://mumbai.polygonscan.com/​
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Mumbai
Network Name: BlockPI Polygon zkEVM
Chain ID: 1101
New RPC URL: https://polygon.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://zkevm.polygonscan.com/​
zkEVM Mainnet
Specs
Network
Network Name: BlockPI Arbitrum One
Chain ID: 42161
New RPC URL: https://arbitrum.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://arbiscan.io/​
One
Network Name: BlockPI Arbitrum Nova
Chain ID: 42170
New RPC URL: https://arbitrum-nova.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://nova.arbiscan.io/​
Nova
Network Name: BlockPI Arbitrum Goerli
Chain ID: 421613
New RPC URL: https://arbitrum-goerli.blockpi.network/v1/rpc/<your key>
Currency symbol: AGOR
Block Explorer: https://goerli.arbiscan.io/​
Goerli
Network Name: BlockPI Arbitrum Sepolia
Chain ID: 421614
New RPC URL: https://arbitrum-sepolia.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://sepolia-explorer.arbitrum.io​
Sepolia
Specs
Network
Network Name: BlockPI OP Mainnet
Chain ID: 10
New RPC URL: https://optimism.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://optimistic.etherscan.io/​
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Network Name: BlockPI OP Goerli
Chain ID: 420
New RPC URL: https://optimism-goerli.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://goerli-optimism.etherscan.io/​
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Network Name: BlockPI BSC 
Chain ID: 56
New RPC URL: https://bsc.blockpi.network/v1/rpc/<your key>
Currency symbol: BNB
Block Explorer: https://bscscan.com/​
etwork Name: BlockPI Avalanche Mainnet
Chain ID: 43114
New RPC URL: https://avalanche.blockpi.network/v1/rpc/<your key>
Currency symbol: AVAX
Block Explorer: https://snowtrace.io
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Specs
Network
Network Name: BlockPI zkSync Era Mainnet
Chain ID: 324
New RPC URL: https://zksync-era.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://goerli.explorer.zksync.io​
Mainnet
Network Name: BlockPI zkSync Era Testnet
Chain ID: 280
New RPC URL: https://zksync-era-testnet.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://explorer.zksync.io
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Testnet
Fantom
Scroll
Gnosis
Cronos
Oasys
Meter
Zetachain
Base
Linea
Tomochain
Network Name: BlockPI Fantom Mainnet
Chain ID: 250
New RPC URL: https://fantom.blockpi.network/v1/rpc/<your key>
Currency symbol: FTM
Block Explorer: https://ftmscan.com​
Specs
Networks
Network Name: BlockPI Scroll Alpha Testnet
Chain ID: 534353
New RPC URL: https://scroll-prealpha.blockpi.network/v1/rpc/<your key>
Currency symbol: TSETH
Block Explorer: https://blockscout.scroll.io/​
Scroll Alpha Testnet
Network Name: BlockPI Scroll Sepolia
Chain ID: 534351
New RPC URL: https://scroll-sepolia.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://sepolia-blockscout.scroll.io/​
Scroll Sepolia
Network Name: BlockPI Gnosis Mainnet
Chain ID: 100
New RPC URL: https://gnosis.blockpi.network/v1/rpc/<your key>
Currency symbol: xDAI
Block Explorer: https://gnosisscan.io/​
Network Name: BlockPI Cronos Mainnet
Chain ID: 25
New RPC URL: https://cronos.blockpi.network/v1/rpc/<your key>
Currency symbol: xDAI
Block Explorer: https://cronoscan.com​
Network Name: BlockPI Oasys Mainnet
Chain ID: 248
New RPC URL: https://oasys.blockpi.network/v1/rpc/<your key>
Currency symbol: OAS
Block Explorer: https://scan.oasys.games/​
Network Name: BlockPI Meter Mainnet
Chain ID: 82
New RPC URL: https://meter.blockpi.network/v1/rpc/<your key>
Currency symbol: MTR
Block Explorer: https://scan.meter.io/​
Network Name: BlockPI Zetachain Testnet
Chain ID: 7001
New RPC URL: https://zeta-testnet-evm.blockpi.network/v1/rpc/<your key>
Currency symbol: aZETA
Block Explorer: https://explorer.zetachain.com/​
Specs
Network
Network Name: BlockPI Base Mainnet
Chain ID: 8453
New RPC URL: https://base.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://basescan.org/ 
Mainnet
Network Name: BlockPI Base Goerli
Chain ID: 84531
New RPC URL: https://base-goerli.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://goerli.basescan.org/​
Goerli
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Network Name: BlockPI Linea Mainnet
Chain ID: 59144
New RPC URL: https://linea.blockpi.network/v1/rpc/<your key>
Currency symbol: ETH
Block Explorer: https://lineascan.build​
Network Name: BlockPI Tomochain Mainnet
Chain ID: 88
New RPC URL: https://tomo.blockpi.network/v1/rpc/<your key>
Currency symbol: TOMO
Block Explorer: https://tomoscan.io/
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Metamask will automatically switch to this network afterward. 
BlockPI Ethereum Mainnet will be on the network list. When you switch to this network you are using the BlockPI RPC service. 

Specs	Network
Network Name: BlockPI Ethereum Mainnet Chain ID: 1 New RPC URL: https://ethereum.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://etherscan.io/	Mainnet
Network Name: BlockPI Ethereum Georli Chain ID: 5 New RPC URL: https://goerli.blockpi.network/v1/rpc/<your key> Currency symbol: GETH Block Explorer: https://goerli.etherscan.io/	Georli
Network Name: BlockPI Ethereum Sepolia Chain ID: 11155111 New RPC URL: https://ethereum-sepolia.blockpi.network/v1/rpc/<your key> Currency symbol: SepoliaETH Block Explorer: https://sepolia.etherscan.io/	Sepolia

Specs	Network
Network Name: BlockPI Klaytn Mainnet-Cypress Chain ID: 8217 New RPC URL: https://klaytn.blockpi.network/v1/rpc/<your key> Currency symbol: KLAY Block Explorer: https://scope.klaytn.com	Mainnet
Network Name: BlockPI Klaytn Testnet-Baobabs Chain ID: 1001 New RPC URL: https://klaytn-baobab.blockpi.network/v1/rpc/<your key> Currency symbol: KLAY Block Explorer: https://baobab.scope.klaytn.com	Baobab

Specs	Network
Network Name: BlockPI Polygon Mainnet Chain ID: 137 New RPC URL: https://polygon.blockpi.network/v1/rpc/<your key> Currency symbol: MATIC Block Explorer: https://polygonscan.com/	Mainnet
Network Name: BlockPI Polygon Mumbai Chain ID: 80001 New RPC URL: https://polygon-mumbai.blockpi.network/v1/rpc/<your key> Currency symbol: MATIC Block Explorer: https://mumbai.polygonscan.com/	Mumbai
Network Name: BlockPI Polygon zkEVM Chain ID: 1101 New RPC URL: https://polygon.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://zkevm.polygonscan.com/	zkEVM Mainnet

Specs	Network
Network Name: BlockPI Arbitrum One Chain ID: 42161 New RPC URL: https://arbitrum.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://arbiscan.io/	One
Network Name: BlockPI Arbitrum Nova Chain ID: 42170 New RPC URL: https://arbitrum-nova.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://nova.arbiscan.io/	Nova
Network Name: BlockPI Arbitrum Goerli Chain ID: 421613 New RPC URL: https://arbitrum-goerli.blockpi.network/v1/rpc/<your key> Currency symbol: AGOR Block Explorer: https://goerli.arbiscan.io/	Goerli
Network Name: BlockPI Arbitrum Sepolia Chain ID: 421614 New RPC URL: https://arbitrum-sepolia.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://sepolia-explorer.arbitrum.io	Sepolia

Specs	Network
Network Name: BlockPI OP Mainnet Chain ID: 10 New RPC URL: https://optimism.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://optimistic.etherscan.io/
Network Name: BlockPI OP Goerli Chain ID: 420 New RPC URL: https://optimism-goerli.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://goerli-optimism.etherscan.io/

Specs	Network
Network Name: BlockPI zkSync Era Mainnet Chain ID: 324 New RPC URL: https://zksync-era.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://goerli.explorer.zksync.io	Mainnet
Network Name: BlockPI zkSync Era Testnet Chain ID: 280 New RPC URL: https://zksync-era-testnet.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://explorer.zksync.io	Testnet

Specs	Networks
Network Name: BlockPI Scroll Alpha Testnet Chain ID: 534353 New RPC URL: https://scroll-prealpha.blockpi.network/v1/rpc/<your key> Currency symbol: TSETH Block Explorer: https://blockscout.scroll.io/	Scroll Alpha Testnet
Network Name: BlockPI Scroll Sepolia Chain ID: 534351 New RPC URL: https://scroll-sepolia.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://sepolia-blockscout.scroll.io/	Scroll Sepolia

Specs	Network
Network Name: BlockPI Base Mainnet Chain ID: 8453 New RPC URL: https://base.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://basescan.org/	Mainnet
Network Name: BlockPI Base Goerli Chain ID: 84531 New RPC URL: https://base-goerli.blockpi.network/v1/rpc/<your key> Currency symbol: ETH Block Explorer: https://goerli.basescan.org/	Goerli

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