To add, remove, and edit Administrators in your account click on the " Cog" wheel in the upper right-hand corner of the Administrator Console then click on Invite Admins.
In the pop window, you can add new Admins by giving them a Name and entering their Email address, and then clicking Share. This will send them an invitation to become an Admin.
You can see all the Admins in your account as well as Edit them. To edit a Name or to delete an Admin just click on Edit.
The options to edit the admin details or delete the user will populate.