To create a new email message, click the New Message toolbar button (the blue pen and paper button). This displays the Compose New Message window, where you can address and compose your message.
In the compose window, you should first address your message. You can enter either a complete email address or a name from your address book. If you want to CC (courtesy copy) or BCC (blind courtesy copy) the message to another recipient, click the down arrow to the left of To in the address field section.