When you enter information in the signup form, the system will verify that the email you entered belongs to a parent/teacher/staff member in the school, and is not already associated with another user.
This is to ensure that only people associated with the school can access the information. It is to guard your security.
The best way to proceed is to send information to your school’s Site Admins. You can do this by filling out the Contact Form. You can get to the contact form from the Help pages, there is a link underneath the list of topics.
Let them know that you are trying to register. Provide them with your name, contact information, and the name(s) of your children at the school, and what grade/homeroom they are in.