Beneath your username it shows you now have 4 Messages. You will need to get that to 10 and be registered for at least one day before you will be able to use the 'Conversation' system (PM).
For some reason when I try to start a conversation with a user named Mrs. McAtee, I’m getting a message that I can’t start a conversation with this user. I have the required number of posts, so I don’t understand why. She has asked that I PM her about points that I want to rent. Please help.