1.On the sidebar menu, hover on the "Settings" button and click "Emails & Texts"
2.Click on "Appointment Reminder" under the "Text Templates" section
3.Scroll down to the bottom and under the Body section, select the desired schedule on when to send the Appointment Reminder
4.Set the status to "Active"
5.Choose the desired time of the day the Appointment Reminder should be sent
6. Hit "Save Changes" once done.