How do I remove myself as a user on a clients QB Online account?

Hello, Angel11-72. 

In QuickBooks, you must be a Master Administrator or a Company Administrator to delete user access in the company. 

Here's how: 

1. Choose Gear Icon. Then Manage Users.
2. Highlight the name of the user you wish to delete.
3. On the bottom right of that field, click Delete.
4. You will now get this message: Are you sure you want to delete?
5. Click Yes.

Keep in mind while deleting a user that this action is not reversible, you will be able to view the history of deleted user in the audit log. 

Also, you can visit this article that where you can surely get more information on how you can manage users in your book: Learn about user types in QuickBooks Online.

Please let me know how it works for you. The Community is always here whenever you have additional questions about it. Otherwise, you can enjoy the rest of your day! Thanks! Take care!