To create child-theme after you made some changes in Theme Options you need to go to Theme Options -> Import/Export section and click export button to get all theme options you have with parent theme. After you downloaded file you may switch to child-theme from dashboard or go to XStore Control Panel -> Import Demos -> Click on import any demo and go through the step of creating child-theme https://gyazo.com/e84804fcc2d45e02e3f0f12994a54732
Once you switched to child-theme you should go to Theme Options -> Import/Export -> import file (you loaded before) -> Save Changes
