You can change your email yourself in My Account
The school admin still sees the original email for their records
Parents can update their own contact details from My Account > Profile, including their email. The updated email becomes the login email used for the account, and the updated email is used for notifications sending.
At the same time, the original email that the school admin entered is still kept on the admin side for record‑keeping, so admins can still see both the original and the updated information.