Facebook share integration?

Hi

What template/file do I need to change in order for me to place the ‘facebook share’ icon below the main picture on the following page

http://www.spurs-web.com/2010/03/30/turner-warns-spurs-that-bent-is-out-for-revenge/

I have loaded the single.php page and I cant seem to find any reference of it in here?

TIA