Save to Home Button

A few of my more non-technical users have asked me how to save the app to the home screen. I am guessing that they were in the wrong browser for their OS ( I just read about the limitations ) or something else. Is there a button I can put in the app to help them? Or should I just direct them to go to the right browser based on their OS and do it that way?

@George_B has a good write-up that he uses. Maybe you could put similar instructions in your app somewhere: