The Messages tool allows you to reply to a message sent to you by another member of the course.
Go to Messages.
Select the Messages tool from the Tool Menu in your site.
Go to Received folder.
Select the Received folder to view a list of received messages.
Open the message.
Select the subject of the message you would like to view.
Select Reply or Reply to all.
Select Reply to reply to the author of the original message. Select Reply to all to reply to all site members included on the original message.
Compose the reply and send.
Compose the reply in the Message field and select Send. The original message will auto-populate in the Message field and be included with the reply.
For information about composing a message, see How do I send a message?