To share this APP with your friends, have them "scan" the QR code with their camera and "save" to their "home" screen. If their camera will not capture the QR code, have them "download" a free QR reader from the Appstore.
Use the reader to capture the QR code. When captured remember to "save" it to their "home" screen.
If that doesn't work, type the URL in your phone and save to your home screen,