bbPress.org

Inside this file: http://www.geekandjock.com/wp-content/themes/parallelus-mingle/bbpress.css

Line 104.

#bbpress-forums .bbp-forums-list li {
display: inline;
font-size: 11px;
}

You will need to change to:

#bbpress-forums .bbp-forums-list li {
display: block;
font-size: 11px;
}

This is the one thing that keeps cropping up when I am on these forums, so once you have got yourself comfortable with this then the rest of the stuff I have done with my forum has been mostly CSS. there is some PHP because I wanted to try and make it a bit unique, but none of it touches the core.

Good luck!