Classes can be created by any teacher in the school account.
1) Select Settings at the top
2) Click on MANAGE in the Manage students box
3) At the top click on Add a class
4) You can now name your class. If you are setting up a class for another teacher you can click on Select teachers to assign them to the class. The class will then appear on their Manage students page.
5) Click Add class on the bottom right to create the class.