In order to add a class to the admin dashboard, click on "Classrooms" on the left hand side. To add a new classroom, click on the blue "Add Class" button on the upper right of the screen.
The "Add Classroom" pop-up will appear. In the "Class Name" field, enter the name of your class, and then adjust the settings below as you'd like—they're all enabled by default. When you're ready, click the blue "Save" button to save your new class and exit the pop-up.
You'll be returned to the Classrooms page with a notification that your classroom has been added. The new class will now be in the table.