In the message center you will see a conversation opened with your private message. At the bottom of that conversation there is a “Reply to this” message. Click that location, type your message, click Send, and you have now replied to your private message. This same method can be used when replying to all types of messages both private and group. You can also reply by simply clicking on NEW MESSAGE, typing in the name and sending a message. This message will become a part of the existing private message thread, just as if you used the “Reply to this” message box at the bottom of the Messages Center.