Hi Emily Corillo. Are you asking how to change the program that you are in to a different program? Or are you asking how to change the dates/times of the videos from the program that you are currently in to different dates/times?
If you want to switch to a different program, you will first need to leave the program you are in to join the other program. To leave a program, navigate to the program page and scroll down to where you see "Changed your mind? Leave Program". Click on that, and then you are free to join a different program.
If you want to switch the days and/or times of the videos from the program that are already on your calendar, you will need to individually go into each workout and change the information. There is not a way to change a block of workouts to either different days or times.
I hope this helps. But please let me know if I misinterpreted your question.