I have created one class, but I want to add more classes. Am I able to do that? I can see how to add more students to the class I have already created, but I don't see any button that will allow me to add another class. Should I just add everyone to one "class," and then divide them into groups? Are educators allowed only one "class"?
http://help.diigo.com/Diigo_Educator_Account
Does step 4 answer your question?
> Step 4: Create A Class Group