I also have a question along the same lines - if I receive a private message (or PM) from someone, how do I reply to this? I have tried to do it through my email by sending a response back to the "private message", but does this actually get to the other person, or is it received by ChristiansUnite Forums instead?
Oklahoma Howdy to Willowbirch,
You receive notices of new messages and private messages at home. However, you can't send forum responses or private messages from home that go through Christians Unite. At least, I don't think you can.

In Christ,
Tom