If you meant you can use it, but don't notice any difference, then you should know it just uses the HTML tag "pre", which does automatic line breaks, but disables wrapping. That's about it for what "pre" does.
See it in work.
To be able to use a real code format, I created a CSS class to which I called "code", put it in style.css and whenever I need it, I just:
Well, see it in work.
You can download this Geeklog class and its instructions from the download section in my site (it's one of the features of the "HTML 2 Text" script).