Reverse or undo an approved user?

My forum is “must approve”. I just approved a user, but I shouldn’t have. Can I undo it?

(Forum not sending emails, so the user didn’t get a notification. It seems that my only option is to suspend the user now, which will appear on their profile page, and carries negative impression which I don’t want to give.)

Go to your admin section, users, go to the user, under Permissions you have active yes or no - you should be able to deactivate the account there?

Does that do what you what it to do?

Edit: OK no it does do what I thought it would after testing it - could do with a unapprove next to the approved field like the deactivate button