Reverse resolution sets your .box name as your wallet's primary name. With it on, apps and wallets that support ENS show your name in place of your long wallet address. You manage it from the Reverse Resolution section of the Identity tab.

A wallet can have only one primary name at a time. If you already have another name set as primary, turning it on here replaces the previous one. my.box warns you before it does, so you can confirm the switch.

In the Reverse Resolution section, choose Use this name for your wallet. You approve the change in your wallet, and once it confirms your name is shown as your wallet's display name in supporting apps. The section then shows an Enabled badge.

Unlike the rest of your profile, this is its own on-chain action rather than part of Save Changes. It is a separate transaction with its own network fee (gas), so you need a connected wallet with a small amount of ETH.

To stop using your name as your wallet's primary name, choose Disable Reverse Resolution. This is also an on-chain transaction you approve in your wallet.