Hello Erick

Have you created an employee, a category and a service? Is the employee assigned to the service? If yes, does the employee have working hours configured, and does the service fit into those working hours?

Those are the main steps you can miss when you only see the loader.

Please let me know. 

Hello Erick

What color are you referring to, sir?

Hi again Erick

Since the color is different than you set it up in the Customization, it's probably caused by a conflict with the theme's buttons, so you would need to inspect the page, find Amelia's Continue button, and change it's color property with custom CSS.

If you don't know how to do it, please provide me the URL to the booking form, and I'll gladly take a look.