Login window still shows deleted account
I am a novice user, and some time ago I tried to create an account with full privileges. I eventually decided I didn't need it, as this db is just for me, so I deleted the account, and now just login using the admin. But the original account name I created still shows up in the login window by default, so I am always backtabbing to delete it out and input "admin" and the password. How do I change the default login account name?