If you receive a message from another user, you can reply to the message with one of your own.
Select the message that you want to reply to.
Click the Reply button.
The system will automatically add a new message. The Priority will default to the priority of the message that you are replying to. The To field will default to the user who sent you the original message. The subject will default to the subject of the original message, with "RE:" in front.
Type the text of your message, and click the Send button.