QR codes are automatically created for you when you create a link in the Author Helper Suite.
Here's an example of a link that has already been created. You can follow along with any of your current links too.
Step 1: Head to a book page
Step 2: Click on the Links tab
Step 3: Click on the View/Edit icon
Step 4: Scroll to the bottom of that page and you'll find the QR codes there. Just right click the image of the QR code and share it.