Layout Help

A very quick post before I start working, sending this off the old Blackberry. How do I change the stupid layout on the blog? I want the lines (the ones either side of the posts) removed, and the columns widening. I've been on blogger layout and thats as useful as anything (not). I still want my background white/fonts the same just spreadout more- and have the one column on the right hand side?

I may actually hate blogger a teeny bit lot today