All available make-up lessons are available to view and reschedule through your account at Trala.com
Once logged in, you will see the "Lessons" tab. If you scroll all the way down, you will see the number of lessons that you have available to schedule, including make-up lessons. After clicking "Schedule a lesson" you will be prompted to select a day, time and teacher for the lesson.
Note: If you do not have any lesson currently scheduled, you will see your available lesson credits at the top of the "Lessons" tab.