Your Parent Access Code is a 12-digit code in xxxx-xxxx-xxxx format that you receive from one of your child's instructors. I recommend reaching out to your child's instructor or directly to your school district who should be able to assist you further with it.
Note: Parent Access Codes are unique to each student but can be used to make multiple parent accounts.
Additionally, if you are looking to register in the community as an instructor then I recommend working with your Schoology administrator who should be able to create an instructor account for you and then share the credentials with you.
Please let me know in case of further questions.