To scan a QR code just open the app, press the Scan and aim the camera at the code and you're done! Everycode Scanner automatically recognize any QR code to which your camera is pointing.
When you run the scan of a QR code for each size bed you will be asked what to do, or if you agree with its contents or launch the appropriate application.

To generate a QR code you just press Generate QR then type QRcode and choose from web page, email, texting, calling phone number or geographic location or current known.
After filling the head required and pressing OK you will generate the QR code that you can save on the same holding.