If you need to know what options are available for your theme, how to edit the design or other theme-related issue, the best way to find useful information is to find the documentation of your theme.
For this, simply checkout in the list of themes on Stastic installer here, there is a “Source” button for each theme. This button leads to the theme documentation.
Useful sections for you: Common theme settings, How to change the design of my website?, Professional support and custom developments, Where do the themes come from?