The messaging system is limited to registered users. Registered users can access the messaging system via the envelope icon in the top right corner of your screen, or by clicking the My Account link and expanding the Models & Community dropdown in the left-hand sidebar.
The message system works very much like email; the main exception is that you send and receive email through the Flirt4Free website.
Click on the COMPOSE icon to send a new message. Type the name of the performer you wish to contact, or select one from a dropdown list of your favorites, and complete the rest of the fields as you would a normal email.
When the performer replies to you the message will show up in your inbox.