On the mobile app, open the Portfolio tab (its icon is your avatar), tap the gear icon to open Settings, then Profile and Account. On the web app, open your account menu and choose Manage account, or Settings, then Account and addresses.
On mobile, scroll down past your display name and bio and tap the addresses row to expand it. You will see your Solana address and then one row per EVM network (Base, Ethereum, BNB Chain, Monad, Robinhood Chain and Arc), plus Hyperliquid.
Every one of those rows shows the same EVM address, because one EVM address works on every EVM network. On the web app the same rows are listed as soon as the panel opens.
Tap or click any address to copy 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, monadvision.com for Monad, etherscan.io for Ethereum, robinhoodchain.blockscout.com for Robinhood Chain, and explorer.arc.io for Arc.