Use this screen do specify an entire look and feel for your league's pages - including colors & images. 

Preview - Click on any of the default skins or the 'preview' text immediately below it to create a new window showing your league with the chosen skin.  This will NOT change your league to this skin.  It is only a preview of what you can expect.

Select - Click on the radio button adjacent to any skin to choose this layout/color scheme for your league.

Current Skins - A table of currently available packaged skins to choose from.

When finished, you MUST click on the Select A Skin button in order to apply your changes.