Directory as a plug in NOT a theme??

I choose the Directory plug in because I have already configured another theme and wanted to include Directory as part of that theme, since it was a plug in I was under the assumption that it wasn't a theme but after installing and configuring it (importing in the additional data for beta testing etc) I realized that you have to switch themes.

I apologize if this has been discussed before, I have found a couple posts but nothing that explains how to integrate this plug in into a different theme. is there some kind of documentation that goes over all the info I need in order to do this successfully? Its not my intention to use the theme, Ive already spent a couple weeks on a different theme with its own content and want to use this as parts of pages or in widgeted areas of pages

Thank you for your assistance!