First setup

As this is a new wallet, it will default to the Ethereum network and show an account with a balance of 0 ETH.

Your wallet address will be partially visible on the first line. You can copy it by clicking on the icon next to it.

Although it's an Ethereum address, the same applies to Polygon, but you need to set the correct network to see your MATIC holdings and other assets on the same blockchain. Click on the top right to add a new network to your wallet.