Setup Metamask With Polygon
1. Download MetaMask from your phone's store, or as a Chrome Extension for PC.
2. Connect MetaMask to Polygon.
If you don't automatically see Polygon as a network:
Go to Settings
Now Enter In the below info:
Network Name: Polygon PoS (Matic) Mainnet
RPC Url: https://polygon-rpc.com/
Chain ID: 137
Block Explorer URL: https://polygonscan.com
You can view Polygon's official guide here.