Hi Allen,
This theme is developed with an own system and didn’t use any page builder. That’s why there has no shortcode.
Moreover, there will not work any HTML markup/code in the button text field. Because, the field is only for putting text for the button, nothing else.
Please watch these video tutorials https://www.youtube.com/playlist?list=PLbmIKrgYlRbq9I5C4_GZN7yBCGgddhprP to customize the theme in the proper way.
Best Regareds,
ThemeLooks Support Team