To change the main administrator on your DIG IN account first make sure the person you are switching it to is not a teacher. If they are a teacher you would have to delete them out as a teacher first.
-Click on Teachers on the top menu and then Edit next to the teacher you want to delete. There you can click on the Delete Teacher button.
-After the Teacher is deleted you can change your profile over to the new administrator by going into your account settings and clicking on Profile.