Take a look at the gif or guide below.
Gif
Guide
Select Admin Settings from the main menu.
Click on the Manage Modules tab.
From the Settings section, select Request Portals.
Click on the portal name to open the Request Portal details card.
Click on the Download button.
You now have the QR Code on your computer as a PDF. Simply print it or send it so others can scan the QR Code and bring up the portal URL instantly.