Just fill in the name of the class (something that represents its content), and perhaps add any existing courses you've created for it. This will help you organize everything as you go. Then save it in your list of classes. Now you will be able to set up an entire structure around it.
Properties explained
Name: Something representative of what the class contains
Code: The short name of the course that can be used like and ID
Description: Any details pertinent to the class you may need to remember
How to edit a Class
After you've created a new class, you can see a preview card in your Classes. You can edit any existing class by clicking on the name of the class, as found on its preview card. This action will lead you to a dashboard. Clicking on the pencil icon, will enable you to edit any of the properties available, through a popup window. You will also be able to create or view your Subjects for this Class.
How to remove a Class
You can delete any existing class by clicking on the name of the class, as found on its preview card. This action will lead you to a dashboard. Clicking on Overflow menu (signified by three dots [⋮]) on the top right hand side of the screen, will give you an option to delete the class.