Teachers can add themselves to a class in their school from the Classes area.
- Click on Classes from the left hand menu.
- Select the Classes tab.
- Change the View to All Classes.
- Check the box next to the class you want to join.
- Click the Add Classes to My Classes.
Note, you may also do this in the tile view by clicking on the Edit Users icon and add class to My Classes.
You now need to distribute the class key to all the students in your class.