How do i send messages on facebook?

Go to your friends page and look at the top right side, bellow to the "Home" button.

Next to your notifications box it will show messages. Click that box and it will say in tiny letters "Send Message" and it ill bring up an email and you type the name who you wanna send it to and the subject and write the message or go to the friends age and the second box below there picture wil lsay Say" Send So and So a message" and its the same.