1. Drag an appointment to a new time
Click and hold an appointment to select it,
Drag it to a new time or day on the calendar,
Release the appointment once you've chosen the new time.
A pop up appears with options to notify your customers
Select the option you prefer and click on Move. It's done.
2. Use the Edit option
Select the appointment that you want to change and right click on it,
Click on the Edit option,
The appointment form appears and you can edit the appointment as needed: you can change the date, the hour, the service, or the associated employee and update your customer contact information.
If you want to send a notify your customer about this change, scroll down to the section "Options" and select the way you want to notify your client.
Click on Save, and you're done.