Navigate to Communications & Events and select whether it is a Manual or Automated template you would like to access and edit.
Ensure the QR code you have generated is saved to your computer as an image.
Once you have created a new message, or clicked to edit an existing template, you will be able to use the "insert image" function to insert a QR code you have generated, and/or any images you would like to include.
Click save once you are happy with the setup of your email template.