When you talk them you have to remember that most of them are there to fuck, but don't message them saying stuff like, "hey lets fuck". Instead your going to have to form some kind of relationship with them at first. Couple of good emails, then a few chat sessions on yahoo, everyone on that website uses yahoo by the way, so that is a must. You just talk to them, then once your comfortable with them talk to them about what their fantasies are and shit like that, tell her yours, blah blah. Then start talking on the phone with her and next thing you know your either at her house or she is at yours.
I recommend definetly posting a pic. If not, your not going to get any action. You get to post like 5 pics. Post one of yourself in nice clothes or something like that. You can post pics of yourself nude, but a lot of girls on there like to have something left for the imagination. At first I did a nude pic and I would get girls, but when I posted a normal pic, and no nudes, I got a lot more. You will also get classier women.
Here's a little secret though. If you want to get laid for sure, go to the Couples Looking for men. There is an ass of swingers on there. Some are looking just for other couples, but there is a lot of them looking for an extra guy to join the party. You know their wives want to get fucked by two men and shit. Some guys just like to watch other men fuck their wives while they beat off. I am dead serious. So check out the couples. That is a definet lay. They will tell you that they want to fuck you, then they want you gone. And don't worry most of the guys are straight so their not going to try and pull some bi sexual stuff on you. Some couples are, but they will tell you upfront.
Good luck and let me know how things go. Remember your probably not going to get any action the first week or two. Just hang in there. Something will definetly work out for you.