EVM compatible chains and networks can be added as a custom RPC network to MetaMask allowing you to access new blockchains while staying on your existing MetaMask wallet.
Step 1: Click on the top right corner profile picture and then on ‘Settings’.
Step 2: Click on ‘Networks’ then ‘Add network’.
Step 3: Fill in the network information and click ‘Save’.
You can use the Sushi UI to automatically add a network to your wallet. On the top right corner of the web page beside your wallet address, you will see the chain you are currently on - you can click this and select another network.