Take a look at the Adsense Help: How do I add sites to my filter list? There is more info there about filters. Hope this helps.
You know, you might be blocking them and they might be actually paying the most out of all ur other bidders?
Use the competitive filter. You will find it in your AdSense control panel. It will take about 2 weeks to filter that site out.
I noticed they where not showing this morning I have had about 50 ads from different sites showing since I blocked it whoo!. I was not making any money with starware ads about 4cent a click.