On Sumdog, there's no School Admin account - all teachers have the same privileges.
Every teacher on Sumdog can:
- invite other teachers to join
- accept a teacher's join request
- create student logins
- create a class... along with all other teacher functions on Sumdog.
This means that when the teacher who created the account leaves, the other teachers will have all the same privileges, including accepting new teacher requests.
To manage your classes click the Manage students panel on your teacher dashboard on the right.
See which teachers are part of your school on the Teachers page. If a teacher is no longer at your school click 'Remove' next to their name.