This tutorial assumes you are already logged in to your Joomla admin panel.
Joomla does not allow you to block or delete a super administrator directly, so you will first need to change the user's group.
1) Click Site.
2) Then User Manager.
Let's see what happens when we try to delete a super admin.
3) Check the box next to the user.
4) Then click Delete.
Joomla will give you an error message.
Now let's change the user's group.
5) Select the user.
6) Click Edit.
7) Choose a new group for the user.
8) Click Apply.
Now that the changes have been applied, we can either block or delete the user. Let's see how to block a user first.
9) Check Yes next to Block User.
Scroll up and right.
10) Click Save.
The user has now been blocked as is indicated by this red icon.
Now let's see how to delete a user.
11) Check the box next to the user.
12) Then click Delete.
The user has now been deleted.
This is the end of the tutorial. You now know how to block or delete a super administrator in Joomla.