How do I send a message?

Head to the top left hand corner of the page, click on the down arrow next to your profile and click on 'Inbox'. The screen you'll see is the messages you've received from your friends. If you want to send a new one just click on the 'Send Message' tab to the left of the 'Inbox' tab and compose your message. When your finished just hit 'Send'.

If you want to reply to someone, open up their message and type your reply into the message box and hit 'Send'.
Click on 'Sent Items' to see the messages you've sent and click on 'Deleted Items' to see the messages you've deleted.