To use Classroom, you need to sign in on your computer or mobile device and then join classes. Then, you can get work from your teacher and communicate with your classmates. When you join a class on one device, you're enrolled in that class on all devices.
You have 2 ways to join a class:
Join a class with a class code—If your teacher gives you a class code, use this code to add yourself to the class. Your teacher might give you the code while you’re in class or email it to you.
Accept an invitation from your teacher—If your teacher sends you an invitation, you’ll see Join on the class card on your Classroom homepage.
Go to classroom.google.com.
At the top, click Add + > Join class.
Enter the class code your teacher gave you and click Join.
A class code consists of 6 or 7 letters or numbers. For example, hjhmgrk or g5gdp1.
Go to classroom.google.com.
On the class card, click Join.