You can create a class once you are signed up as a Teacher. This can be done in several ways -

From the Learnabily Card

• Click Create a class below the Take a quick tour link
• Click School and pick your school from the list of the schools in Select School screen else, the new school can be added by clicking on New on the top right corner
• Enter the Class Name
• Click Save

The class gets created and can be accessed from the left navigation tray.

 From Left Navigation Tray 

• Click +Class/Group at the bottom
• Click Create New Class/Group
• Select Group Type as Class
• Click School and pick your school from the list of the schools in Select School screen
• Enter the Class Name
• Select Grades in Select Grades Page
• In Create class page, I'm a Teacher and class options are preselected
• Click Next
• Select the required option from Give Student Access screen

The class is created and can be accessed from the left navigation tray.