If you have not set a time for the lessons on your calendar, it will display Set Time.
Click on "Set Time" and type the start time and end time. If you want to set the time as the default time for these lessons, check the box and it will set this as your time for all lessons in this course.
If you want to edit the time for a lesson for a particular day, you can change the time for just that day by overriding the time on your calendar.
**If you are changing the time for just that day only - make sure the box for setting the default time is unchecked.