To add an icon to the home screen on your iPhone, iPod Touch, or iPad when you’re looking at the home page of the app in Safari select the button shown below and select “Add to Home Screen.” You must be using the Safari browser to view the app in order to see this option.
On Android, it’s slightly more involved, depending on the browser being used:
Most new smartphones can scan QR Codes using the built in Camera App. Just go to take a picture but don’t click the camera button, a pop-up should display when viewing the QR code through your phone that will allow you to click the link provided by the code. If your phone doesn’t support QR codes in the camera app, you can download a QR Code Scanner app from the appropriate app store for your phone.