You'll need to start with your school's PowerSchool administrator. If your school's Web site doesn't have that information, your school's office should (hopefully) be able to direct you to whoever is responsible for maintaining the PowerSchool software at your school.
Thank you for reaching out for assistance on the PowerSchool Community!
Another PowerSchool Community member faced a similar issue and the resolution was provided in this thread. I recommend reviewing the thread by clicking on this direct link.
Please feel free to reach out to us if you have any follow-up questions.