When you have installed the plugin, the menu items for all ThemeBuilder Administration Screens will display in the Confluence Administration left hand navigation. (you may need to refresh the page).
See ThemeBuilder Administration Screens for an overview of each of these menu items.
The ROOT skin that comes with ThemeBuilder mimics the Confluence default theme. When designing a new user interface for Confluence it helps to refer to this default view so you can judge which navigation items and functionality you need to include in your skin.
It will help you plan the design if you mark off panels that will be created or edited to build a skin. This image shows how the various areas in our ROOT skin relate to the content displayed on the page.
There is a ROOT skin installed with ThemeBuilder based on the Confluence 5 site design. This is a good base for a new skin.
See New Skin Based on ROOT for how to use ROOT as a starter skin.
See Skin Editor - Panels for information on how to add and edit panels.
Our Skin Customisation section has tutorials on using ThemeBuilder, including advanced topics such as Dashboard items and conditional logic. ThemeBuilder also has a range of macros that can display Confluence content in simple lists or a more visual format.