(2) Click on the link on the top right of the page which shows how many messages are in your Private Message box. This link is right next to the words "You are logged in as [username]". This will bring you to your inbox.
(3) To open a message, click on the message subject.
(4) To close a message, click on the message subject again or open another message. To respond to a message: (1) When the message is open, click on the "Reply" button. The username of the person to whom you are responding will be autofilled in the "To" field.
(2) Type your message.
(3) Click "Send". To write a new message: (1) Click "Write New".
(2) Type the username in the "To" field.
(3) Type a subject (optional).
(4) Write your message.
(5) Click "Send". NOTES: (1) If you want to send a Private Message to multiple recipients, insert commas in-between their usernames.
(2) This function is not very forgiving so be sure that you have spelled the usernames correctly. Otherwise, when you click send, you will get an error message and lose what you typed. (I believe that this problem will be addressed in a future software release but do not know when.)
(3) When I send Private Messages to multiple recipients, I highlight and copy what I have written so that if I did misspell any usernames and lose the text, I can just hit the "back" button on my browser and copy the text back into the message. (Interestingly, the usernames and subject remain when this happens.)