The PowerSchool Community is a great resource if you have any changes to be made while completing fields within the enrollment form. You can check out the FAQs related to the enrollment process here.
Each school has a different process and can provide the best steps to move forward when enrolling students. Some districts provide direct links to access the registration forms while others use the PowerSchool Enrollment portal for the registration process. The link and access credentials are generated and provided by the school.
You can also check out the school's website and access the forms from its registration page. I recommend contacting your student's school/district directly to request the instructions to access the student's enrollment forms.