1. After logging in, navigate to the "Classes" tab and click "View assignments" on the class you wish to add/remove lessons from.
2. Click "View lessons" for the desired assignment.
3. Click "Add/remove lessons"
5. Expand the drop downs for the course/sections to view all of the available content.
6. To add a lesson, check the box next to lesson. To remove a lesson, uncheck the box next to the lesson.
7. Click the "X" in the top-right corner of the window to save changes.