BuddyPress.org

I am using a custom child theme using Genesis Framework and have installed both Genesis Connect and BuddyPress. I am also using bbPress for site-wide forums. All seems to be functional. I would like to now go in and tweak things like how the Profile page lays out (size of the image, header text, how the profile details present), how the login information presents, etc., but I’m not sure which CSS to update. Do I add the appropriate CSS to my Child theme or do I go into BuddyPress?

The site is definitely still in development, but here is the URL: http://internationalfamilynursing.org/2012update/

I need some guidance. Any help would be appreciated