Ah, you can't sign up directly on Piazza without a Princeton email, but if you sign up using the Google form link, we'll enroll you on Piazza. (We do this manually; about once a day.)
To limit enrollment in your class, by default a school
email ___domain is required to self-enroll. If your school
does not provide students with school email addresses,
instead a class access code is automatically set to
limit enrollment in your class.
