To print QR codes, go to your Manual Listings page.
Select the items you would like to download QR codes for. Scroll down and click Download QR Code Labels for Selected.
You will be able to select which labels on the sheet you would like to print to. Click Download.
A PDF file will be downloaded to your device. You can then print the labels.
This tutorial video gives some details about using QR codes. https://youtu.be/6Wy1eR1oLto