Thank you for joining us here in the Community, clareduncan42.
I'd be delighted to help you with your concern. To get me on the same page, I have to gather more information.
Are you going to apply the rent income to a specific transaction? Is this a downloaded entry that you're categorizing on the Banking page?
While I wait for a response, you can look through these resources to learn more about account and detail types, as well as how to manage accounts in your register: