Your .box name can hold wallet addresses for other blockchains, so your name becomes a single place people look up where to reach you. You manage these on the Addresses card of the Identity tab.

You can add an address for each of these networks:

Your Ethereum address is set separately, as the Primary Address on the Profile card, since that is the address your name resolves to on Ethereum.

On the Identity tab, choose Edit Profile. The Addresses card shows a row for each network. Type or paste your address into the matching row. my.box checks the format for each network and flags an entry it does not recognize (for example, "Please enter a valid Bitcoin address."). To remove an address, clear its row with the X next to it.

Addresses are saved with the rest of your profile when you choose Save Changes. This writes them to your name on-chain in a single transaction that you approve in your wallet, so you need a connected wallet and a small amount of ETH for the network fee. See Set your ENS profile for how saving works.