Hi there. My crystal ball isn't giving me a clear picture of "that box thing" so I don't don't know where to begin to try and help you. If you want help it would be best if you specifically stated what your question is along with as much information as you can provide.
Have you purchased a css customization upgrade? ->Dashboard -> Upgrades -> Custom CSS
If so have you followed these instructions? http://wordpress.com/blog/2006/08/04/custom-css/
Viewing your page source depends on your browser. In IE, click on View along the top and they'll be an option to view called "Source". In Netscape, it's View and then Page Source. In firefox it's "View" and "Page Source" or ctrl+U.
P.S. Happy belated Birthday!