you can contact them through the web-site. Who knows, maybe you are in luck and it's a good dealer.
But, use common sense ok. I would not trust a random guy i meet there with high amount of money. At least not until i've met him a few times and feel he's not up to something fishy.
And if you manage to agree for a personal meeting with a guy from that web-site, always demand to meet at a public place where theres other people around. Don't wanna end up being mugged in a alley somewhere, you know.
That web-site is like craigslist.com for bitcoins, so you could end up meeting a crazy guy for what i know. LOL.
So, as they say "Buyer beware!"