http://forum.toribash.com/showgroups.php

Scroll down untill you see the section for Market Squad

Then press the person you wish to speak to's name.

When you get to their information page just click the tab in the middle of the page which says "Contact info" and then press "Send Private Message"

Should bring you to sending a message to that person. Then just say what you want and send the PM


Or you can choose the name and just go to Pm's and type the name in.