Join a class
Type your class ID.
Your teacher gives each class one ID. It takes you to that class's live page and video call on your class server, where you sign in with your usual username and password.
No class ID yet?
Ask your teacher. An ID is not a password: you still sign in with your own account, and only students on the class roster get in.
Teaching the class?
Make or renew the ID in keepsetup-instruct, next to the class code. A renewed or revoked ID stops working at once.
Already on your class server?
You are reading this page from the server itself, so the ID takes you straight to its sign-in.