You can change which users are allowed to make changes to the system by giving them administrative privileges.
Projecte de documentació del GNOME
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David Aguilera
david.aguilera.moncusi@gmail.com 2011

# Change who has administrative privileges

Administrative privileges are a way of deciding who can make changes to important parts of the system. You can change which users have admin privileges and which ones don't. They are a good way of keeping your system secure and preventing potentially damaging unauthorized changes.

Click your name on the top bar, then click the picture next to your name to open the User Accounts window.

Click Unlock and enter your password to unlock the account settings. (To give a user admin privileges, you must have admin privileges yourself.)

Select the user whose privileges you want to change.

Click the label Standard next to Account type and select Administrator.

Close the User Accounts window. The user's privileges will be changed when they next log in.

The first user account on the system is usually the one that has admin privileges. This is the user account that was created when you first installed the system.

It is unwise to have too many users with Administrator privileges on one system.

GNOME Documentation Project

Explain how admin privileges can be given to other people, or removed. Warn the reader about how it's unwise to have too many admins on a system.