Using Simple Catch as a parent theme?

Hello,   I want to use Simple Catch Pro as a parent theme, to make sure that my customizations don't get lost on upgrade. Since I guess the directions for creating a child theme will be the same for both the free and the paid version, I am asking the question here so that even users of the free version may benefit from the help I hope to obtain. :-)   I am not a WordPress coder - more a user with some limited skills in html and php. So I just want to know how I can create a child theme based on Simple Catch Pro to use as a starting point for my planned customizations. Any help will be highly appreciated.   Thank you.