Your wallet addresses are located at Profile, then Settings, then Account. Scroll down past your display name and description to find all four addresses listed: your Solana address and your EVM address (which is the same across Base, BNB Chain, Monad, and Ethereum).
You can copy any address by tapping on it. These are the addresses you would give someone who wants to send crypto to your fomo wallet, or that you would use to look up your transaction history on a block explorer.
Block explorers by network: solscan.io for Solana, basescan.org for Base, bscscan.com for BNB Chain, monad.socialscan.io for Monad, and etherscan.io for Ethereum.