You can rename an eBay account in the menu Setup » Markets » eBay » Accounts » Auth’n’Auth. This is necessary, for example, if you have changed your username on eBay.

Renaming an account

1. Open the menu Setup » Markets » eBay » Accounts » Auth’n’Auth.
2. Click on Edit (pencil icon) for the desired account.
3. Enter a new username.
4. Save (💾) the settings.

The account will then be renamed.