Note: You can only assign administrative rights if you yourself have the administrative right Manage administrators.
Grant rights
You can only assign rights to already existing users, so make sure you have added the user first.
Click the menu item Settings, then click the menu item Administrators.
In the appropriate section, click in the Add administrator box.
Start typing the name of the person. As soon as the name appears in the dropdown list, you can select it.
Withdraw rights
Click in the appropriate section on the "X" next to user.
Added administrators appear in blue. Your own user is grey because you cannot withdraw rights for yourself.