When you go to Customize, there you will see various options available to customize your site. Just try those options one by one you will be able to understand how the theme works and can create any kind of site.
Some Available options in Customizer:
- Site Identity
- Header Image
- Background Image
- Homepage Settings
- Theme Options
- Additional CSS
The Flash Blog-Plus Premium theme has additional features than the Flash Blog Free theme, which are indicated in the corresponding customization options. However, some features are same and are not described in the customizing options provided, but the customization process is same as free theme.