From Wiki

• Sometimes you may want to communicate privately with another member of the forum.

• You can do this by sending him/her a private message (PM).

• Go to a message that has been posted by the person to whom you want to send a PM.

• Click on his/her User Name in the top left hand corner of his/her post.

• That will take you to the relevant member's Profile, and on that screen there is a link that allows you to send him/her a PM.

• There is one limitation, and that is the fact that you can send PMs only after you have posted three messages on the BE forum.