Welcome to Community! @Tinney2020
Any information such as Name, Date Of Birth, Gender, student's grade, or any other pre-populated information could only be updated by the School district. If you need to update any such information while registering your child, I recommend reaching out to the Enrollment section of your school district who should be able to assist you with the issue.
The article Editing Pre-Populated Information discusses the topic in detail.
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Would you please confirm if by ps number, do you mean a snapcode?
Snapcodes are provided by a school district and not provided by PowerSchool. If you are facing difficulty obtaining a snapcode, please reach out to the Enrollment section of your child's school district.
For more information please refer to the knowledge base article titled No Snapcode.