The theme page under Settings is where you can manage the look of your site and add your own branding.
Site Theme
The top section is where you choose the theme for the entire site.
The theme selected will be giving to all new users.
If you choose to "Allow users to pick their own theme" then the theme section in their profile will be available for them to pick a different theme than the site theme
If this option is NOT on, then all users will be set to the site theme.
Reset theme/colors/images
Use this link to reset the site to the original colors and logos when you first purchased your subscription. Here you will be given the option to pick from the 3 themes, and picking one will reset any changes that were done below.
Branding
This section is where you can use your own logos and background images as described on the page. These images will be used regardless of the theme chosen.
Light Theme Colors
If you choose the light theme, you can pick your own colors. The primary color is used when things need to stand out, like buttons and alert bubbles. The secondary color is used on the top of the page, behind the navigation, and in various other elements.