Don’t worry, there’s various things to try:-
1. We emailed a copy of your username and password when you registered. If you can, go back and check that email.
2. If you’ve’ve deleted that email, or you can’t check it at the moment, then click on the forgotten password link and we can email it to you again.
3. If that doesn’t work (for example, if you didn’t give us an email address) then your teacher can email us at email@example.com telling us your name and username. We’ll email a new password to you.