To receive assets via QR code, you will simply need to share your QR code with the person who you are receiving assets from.
To access your QR code:
From the main Stargazer page, select the asset that you would like to receive
To expose the QR code for this wallet address, tap the QR symbol in the top right corner.
Show the QR code to the person who wants to send you assets so they can scan it.
Trying to send assets? Check out this article on how to send assets using a QR code.