The messaging system is limited to registered users. You must buy time or a VIP membership to establish an account before you can use the messaging system.
If you are a registered user you can see the link to the message system once you login to your account.
The message system works very much like email; the main exception is that you send and receive email from the website.
Click on the COMPOSE icon to send a new message. Type the name of the performer you wish to contact and complete the rest of the fields as you would a normal message.
When the performer replies to you the message will show up in your inbox.