hi there, is there a way to set the icon when users save the url to mobile home screen? thanks

My apologies, I am not quite sure what icon you are referring to.  If you wouldn't mind providing more detail, preferably a screenshot of where we can find the icon you would like to replace, we will be happy to see what we can do:

http://www.jotform.com/answers/414264-How-to-include-screenshot-image-in-the-support-forum