Could you be a little more specific with what you're looking to do?
It looks like your website isn't responsive at all, so making the whole thing responsive is a pretty large project. I can help, but let's take it one step at a time!
On a larger scheme, you could look into translating the theme over to twitter bootstrap. That would make it easier in the long run but would take some time setting it up properly.
The other way to make things responsive is to use percentages for widths and heights, etc and also using @media queries. You can read up a bit on some stuff here http://css-tricks.com/css-media-queries/
Let me know your specific questions and i'll help out.