[theme twenty twelve] use logo instead of website name

Hi,

I’m trying to make a website for a friend of mine using the twenty twelve theme.
I was wondering If and How it’s possible to use a logo instead of the website name.

The website Im making is currently at https://tas.grootewolthaar.com

Could you help me with this?
Or if its not possible, could you suggest a theme I could use and still have highlighted pageheaders?