If you prefer an external link that leads to your scheduling page, you can switch all of the "Book/Schedule Appointment" buttons to that webpage using "Click Actions" tab on the right.
If your booking system has an "embed code" feature, you can embed code on this webpage. To do that, you would add an embed code box (from the bottom center of the Showit builder) and paste in the code from your booking system.
If you're not ready to use a booking system but you still want guests to be able to request appointments through your website, you can use the pre-built form below and just replace this text box with any information regarding scheduling appointments that you might want your guests to know. When guests fill out the following form, their message will go to your email that you have set up associated with your Showit account.