If you have any Joomla Super Administrator accounts in Joomla that you don’t use or want, you should delete them for security reasons. However, if you have ever tried to delete a Joomla Super Administrator, you will find out that you can’t. You must first change the account group to any group other than Super User.
In order to delete a Joomla Super User account:
- From the Joomla Admin menu, select Site > User Manager.
- Click the Super User account you want to delete.
Joomla opens the user account screen.
- In the Group list, select Registered User and then click Save.
Joomla saves the account information and takes you back to the User Manager screen.
- Click the checkbox for the account you want to delete and then click Delete.