Adding Icon to Your mobile Home Screen iPhone.
View the web site on your phone, click on the icon bottom right this will put the download icon at the bottom centre, then click on the download icon, scroll to the option "add to Home Screen" replace "HOME" with "Association", Click add.
You can also hold your finger on the icon and share the link with others.
Android Phone. Various ways to do this dependant on phone make. View web site on phone, click the 3 dots which can be at the bottom or top, again add to home screen appears, select this and change name to "Association".
You also have the ability to share with others, but this is done whilst viewing the web page.