SUclass uses the WebAuth system to manage accounts. When you are accessing SUclass for the first time, click the "Sign in" button on the top right of the home page. You will be directed to sign in with your SUNet ID. The only remaining step is to decide on your username, which is what other users will see when you post in the forums. Keep in mind that usernames must be unique so if someone has already claimed your preferred username, you will need to think of a different one.
After this initial login process, you will continue to use your SUNet ID to log in. Your account on SUclass is separate from any account you may have on lagunita.stanford.edu (previously class.stanford.edu).
If you are a faculty or staff member at another institution who needs access to a Stanford-only course, please contact the instructor of that course and ask them to reach out to the Course Operations team.