The Theme Manager will allow you to do specific CSS overrides for Bootstrap classes and to have your own set of preset configurations to any given Bootstrap based Theme.
You can see a list of current themes uploaded with various information and a screenshot if one exist.
You can choose to Manage a Theme or to set a new Theme Active from this section.
Theme Overview
Theme Name: The name of selected Theme
Theme Description: Developers description of the Theme
Theme Developer: Developer(s) name(s)
Developer's Website Link: URL to the Developer(s)
Version: Current version
License: Theme license
If your Theme have a Widget developed to it, you can install and handle the Theme Widget from this section.