The PowerSchool Community is a great resource if you have any difficulties completing fields within the enrollment form. Each district, however, has a different process for student registration and can provide the best steps to move forward when enrolling students.
You would need to reach out to the district directly to inquire about the transfer of your child. They should be able to provide you with the most up-to-date information on how to retrieve your seat for enrollment.
You can check out the FAQs related to the enrollment process here.