Three questions regarding the Vigilance WP theme

Hi all. I just started using wordpress and so far I think I’m doing really well, however I am stuck on a few things.

1) As I stated before, I’m using the Vigilance theme. With that said is there anyway to set a custom background? By this I mean an image, like a family photo or what have you(in the image below it would be the area in black).

2) Is there anyway to have one of the tabs at the top redirect to another URL when you click on it? For example, like maybe clicking about and having it redirect to a personal facebook account.

3) Is there anyway to add a divider below my featured content gallery and my posts? A 2-3px thick line perhaps.

Here’s the theme in question if it’s at all useful:

http://i32.tinypic.com/vyum2p.png