How I use this directory plugin in my existing custom theme

Hi There,

I am a bit annoyed because after buying and installing this directory plugin I figured out that I need to change the theme. This was not mentioned from your site on the description page! If I would knew that I would have spent 35 Dollars.

So is there a way to integrate this pluging to my existing page http://www.zueri-see.info?

Kind regards
Julia