Rescheduling appointment is a easy process 
You have two options:

Option -1: (Recommended)

  1. Cancel first appointment. 
  2. Create new appointment.


Option -2:

  1. Select appointment which need to be rescheduled.
     
  2. Change the date and time to new one.
  3. Save the appointment using SAVE button.
  4. Once appointment is saved, a pop-up window will appear to send SMS, select YES.