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.
If you are planning to update your address in the form after shifting, you would need to reach out to the district directly and enquire about the process. They should be able to provide you with the most up-to-date information.
You can check out the FAQs related to the enrollment process here.