In order to create a QR code, you would be required to enter your URL, your text, a SMS or vCard contact information. It would be pertinent to mention here that the QR code would be generated automatically when you type on https://www.oysso.com. You would need to click on the download button and generate your customized QR code image.
You would be required to embed the QR code directly on your own site and make use of it. You should simply have a look at the code offered by the embed button. Apparently, you could place and make use of the QR graphic on posters, leaflets, business cards, and other available products without any charge.