- goto Schedule -> Calendar in your Control Panel
- click on empty time slot on calendar on Start Date of course
- click 'Create Class'
- Fill out applicable parameters.
- After creating this, go back to the calendar and navigate to when you want this course to end. Click on the class after the last one.
- A modal will pop up, click 'edit' in top right.
- The last toggle is 'delete', set this to YES.
- Select 'Delete this AND ALL future classes.' radio button below
- Hit 'Edit Calendar item' to confirm.