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: Arb1RPC: https://arb1.arbitrum.io/rpcChain ID: 42161Currency Symbol: ETHBlock Explorer URL: https://arbiscan.io—Network Name: arb-novaRPC: https://nova.arbitrum.io/rpcChain ID: 42170Currency Symbol: ETHBlock Explorer...