Hello Kat.nie,
As far as I know once you set up the Administration Account password it is always there. I can't find anything about deleting the admin account. I would recommend contacting Support at 1-800-821-2797.
I have just purchased this printer new. I set up an admin account when running the initial setup, but have changed my mind and want to remove it, so that there is no admin account at all. I can't find any option to do this in the menu, and restoring the factory settings or re-running the initial setup doesn't help. What should I do?