Open the Inbox, click on a message in the Inbox to open it
(alternative option: click on a patient's name in any report to open messaging window)
Click on the "Canned Reply" button
Click on the the folder you want to create a new canned reply and then click "Add reply"
Then create your canned reply and click "save"
To use the canned reply you have created, you can just click on the "Canned reply" button again and then select the canned reply from the list.