Board Thread:Off Topic and Fun/@comment-34461139-20190529140943/@comment-26569706-20190725220702

You can't change the username of the NotTheBunny account to RobbiePlays77 because your RobbiePlays77 account is already using that name.

If you want the RobbiePlays77 name, your only choice is to edit from that account and have NotTheBunny blocked infinitely.