Help With Post & Headline - Need Less Trapped White Space

Hi,

First thanks for this forum and thanks for creating a pretty darn kick butt theme for WordPress.

I am trying to have the body of my post wider.

http://garyandwendy.com/wordpress/

If you see on my blog.

Header

Body (Post) (White Space) Column.


My goal is

Header

Body (Post) Less White Space Column


I took about 1 hour looking through the options and could not figure out what to do.

Thanks in advance for you help.

Gary