If teacher want to edit course which already shared to students, please remind the course content will also change, steps are very similar with new add course.
Choose the course teacher want to edit, there will be a toolbar, select "edit".
Step of edit Course & new course are almost the same. Demonstration of add new book and delete book as below,
2. Add new book
Tick & select course on right hand side of the screen
Choose "Edit" from the toolbar shown on the bottom
Choose "Structure"
Press "+", add new book into the course
Press "OK"
3. Delete book
Tick & select course on right hand side of the screen
Choose "Edit" from the toolbar shown on the bottom
Choose "Structure"
Select book you want to delete, press " Delete" from the toolbar shown on the bottom