Re: Trying to integrate bbpress with my wordpress
h2.postform is in /bb-templates/k2/style.css, line 194. It’s stretched like that because it by default takes up the whole width of the parent element, which is Secondary. It is more effective to set the width for Secondary than for the child elements, because the Secondary width will automatically control all the child elements too. 
Firebug is an invaluable HTML, CSS and JS debugger.
