You would need to start editing your theme template files.
Ok. I’ve started messing with some of the files like style.css to adjust the width of the actual web page. Still can’t quite figure out how to get rid of the inner right sidebar – so annoying.
Which theme template files?
try to edit style.css; find:
#content {
width: 70%;
float: left;
}
change the one line to width: 95%;
(only checked in firefox3.6, with web developer add-on; not cross-browser tested; not site-wide tested)