Is there a easy way to order and what does PM mean?
PM is a personnel message.
A couple of ways to do it, if you see the persons details on a post they have a couple of icons down the bottom, hover over with the mouse and one will allow for a pm, its kind of like an internal email.
If not go to the top of the page and click on messages, then type in the persons name and away you go. I have sent you one for fun