You can find your Google Classroom code on your course's class card on the desktop website or mobile app.

Students can join a Google Classroom via an email code they received, a class link, or a specially assigned class code.

I walk through how I set up and use Google Classroom to make teaching easier and more organized. I show how to create a class, invite students using a class code or email, and share assignments ...

To log in to Google Classroom, begin by opening a web browser and navigate to classroom.google.com Next, enter a personal, organisation, or educational email account and proceed by pressing Next.