http://manual.b2evolution.net/FAQ_-_customizing_my_blog should help. In particular http://manual.b2evolution.net/Remove_the_sidebar talks about removing bits you don't want.

I see. Well, I went there and edited everything I don't want and it's all still there. :-/

Got Link? Giving us a link to your blog makes it a lot easier for us to tell you what you need to do. We're kinda hip to driving around b2evolution installations is the thing.

You need to edit the right skin to get the desired results. So like if you're using 'foo' as your skin then you edit skins/foo/_main.php. Further: if you're using 'foo' and you edit skins/bar/_main.php you won't get any bang for your buck. Does that make sense?

The link is http://www.mitchel-musso.com/blog/