BuddyPress.org

I’ve used firebug to look at the forums on the site I’m building – rebeccadavidsonextremecouponing.com.
I have GenesisConnect, so many of the attributes of my Child theme are inherited by Buddypress. However, I DO NOT want this. Where and how can I change the width of the buddypress pages, as well as remove the subnav image that it’s inheriting from my current images on my child theme?

Also, is there an easier way to manage forums (say from the WP dashboard….like you can with BB press?) Instead of doing it through the actual page?