To use the QR code you need a Smartphone
With an iPhone: Hold the phone’s camera so that the QR code in the viewfinder. A link to a webpage will appear on your screen. Tap on it to go to the page attached to that QR code.
With other smartphones you may need to download a QR reader app. Once you have done so the process is the same.
The easiest way to obtain the code for your own use is to take a picture of it and insert that picture into your documents or posters.