social theme – header and buddy press question

Is there a way to make the social theme top header bigger? I would like the uploaded picture (and if possible the tabs) to go across the screen. I also don’t see the front page format that is shown in the theme picture. Where is the option for the front page image?

I chose this theme because it has buddypress and would like to install buddy press, but the more I look at it, I’m wondering if it’s too complicated for someone with very basic html/css skills to install? Is there a plugin that might be a better option for an internal social networking forum or better documentation on installing buddypress into the social theme?

Thanks for your help.