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 administrative privileges and which ones do not. They are a good way of keeping your system secure and preventing potentially damaging unauthorized changes.
You need administrator privileges to change account types.
Open the Activities overview and start typing Users.
Click Users to open the panel.
Press Unlock in the top right corner and type in your password when prompted.
Under Other Users, select the user whose privileges you want to change.
Set the Administrator switch to on.
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 administrator 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.