As a School Admin, you can add users/coordinators to your RegiSmart account by clicking Users in the left-column menu. Then select User List. You will then have the option to click the +Add User button on the top right of the page to send an invitation to a user you would like to add to your school’s account.
The School Admin can delete current School Sub-Admin users by clicking the red trash can icon that appears in the Role column when you scroll over the user's name.