Change user status to administrator

An administrator can change other users roles. They can also invite new users or admins, follow this link to see how. 

To change a users status, start out by choosing Settings in the menu to the left. 
Then click on Users. 
 

From here you have to choose which user you want to change.

From here click on User Role and choose Administrator.

When you click on Save changes, a popup window will appear where you have to acknowledge your action. When you click confirm, your changes have been saved.

See here how you deactivate a user.