Clae Space review for BTA Appointment Booking App

I can't explain or comprehend why this app is so user unfriendly. Doing anything simple, like changing the email address that emails are sent from, require so much more information and time than any of the other platforms I use. Even adjusting email templates for Reminders, require HTML knowledge and competency with Liquid Variables! With the cost of this app, the time spent trying to brand it has been incredibly frustrating. The good points are its flexibility for having courses (that run multiple weeks) or classes and lots of input details. However these have been outweighed by my frustration in trying to do simple branding exercises on the platform. If anyone has any suggestions on either how to make it easier or another app, I would appreciate it!