This article is about customizing invitation messages for Vyte events (group meetings) and not for appointments booked from a Vyte page.
To customize the message sent to all your guests when creating a Vyte event, simply insert the desired message in the "Add a message" field before sending the invitations.
You can create a default message that will be automatically used for all future Vyte events you plan. To do so, go to the advanced scheduling settings (Settings > Advanced Scheduling > Group Meeting Settings). Create your default message and save your changes.