NextGen - How to set up how many days before to send appointment notification ?

NextGen - How to set up how many days before to send appointment notification ?

1) Please click on the clinic settings restricted icon as shown below. Navigate to notification then Send Appointment Reminder Before and set up the number of days. 

A > Click on Clinic restricted.

B > Click on Notification.

C > Click on checkbox > Send Appointment Reminder Before and set up the number of days.