XDForum Format questions

I’m trying to do some simple things ( think) to cutomize my forum, but am going blind looking through the code. Does anyone know where I can increase my font sizes, specifically the titles and descriptions of different sections? The default font size seems very small.

Also, I can’t seem to get my forum off the right border of my main page, but I haven’t been able to do anything in my stylesheet or mainpage template to add some padding.

Here’s what my forum looks like at the moment: http://phyzica.com/blog/wordpress/?page_id=21

Thanks in advance for any advice!