Firstly access the course that needs to be changed.
Route: School > Programmes > Current year Courses. Click on the required course and click on 'More information.'
Click on the class you want via 'Classes and Lessons' overview.
Once you click on a class you will see a slide-over with an edit option.
Click the edit button and change the end date to end the class. It is not advisable to change the times of the classes as these changes will also affect previous classes and existing attendance marks. Once you have ended a class then click on the plus button next to "classes & lessons" to add an alternative class for the next term with the required dates/times.