Add an Arbitrum Network manually by following the steps below.

Click on the metamask extension > click on “Ethereum Mainnet” network > click on “Custom RPC” at the end of the menu, and enter the information corresponding the the Arbitrum chain you want to connect to:

• Network Name: Arb1

• RPC: https://arb1.arbitrum.io/rpc

• Chain ID: 42161

• Currency Symbol: ETH

• Block Explorer URL: https://arbiscan.io

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• Network Name: arb-nova

• RPC: https://nova.arbitrum.io/rpc

• Chain ID: 42170

• Currency Symbol: ETH

• Block Explorer URL: https://nova-explorer.arbitrum.io