Since Zach has been fielding questions about HTML, I thought I would lend my two cents in here. It would behoove you to learn the UBB code that functions with this software. While it isn't as robust as HTML, it's a lot easier to learn, and if you should accidentally make a mistake in the code, it won't take down the entire thread, unlike HTML.
The UBB code is referenced to in the FAQ, you should be able to learn about it there.
Hope this helps, it is really easy to learn.