When you open the application, it offers you two options as QR Code or Text.
When you choose QRCode, the mobile phone camera opens, and you
can read any "QRCode" via the camera, and then the app converts the QR Code to text for you
If you choose the "Text" option. You can write any text in the input area, and then when you push the "Submit" button, the app creates the QR Code for you.