There are 2 ways to send messages to another member:
- click "inbox" on the right side of the screen. Then click "compose" (just left of the word "inbox"). Choose from your friends who to send the message to (you can only send messages to friends)
- click on the member you want to message. On the bottom left of the screen (you might have to scroll down) click "Send message". If they are not your friend click "add as friend" which is in the same place as "send message".
Fill out the fields and then send the message.