Making the sidebar narrower, and the main content area wider.

With the custom default wordpress I can do these these, having issues with this theme I love.. love.

I am trying to make my white text area only a little wider like 15px. Yet I may be wrong but it seems I can not do this with my current theme, without moving the entire page out, including side bar as well. When I do this my side bar content shifts inner and or make the side bar a little narrower. Please advice seems no one else knows.

But If this is impossible then I can widen the entire page and move the side bar content to the right a little back in place. Please Please help, this is really holding me up. Thanks, Ronnie

I need to fit this cam on the white section and also would be nice to make the side bar a little narrower. The page is here, please help. northeastsurfing.com/index/cams