For clients using iOS, here's a helpful animated GIF that you can email to them.
It also is great to put on your website to explain how the save-to-home screen feature works in an easy-to-understand way.
Unfortunately, due to the inconsistency with Android/Windows devices and operating systems and how this feature works on those devices, we don't have an animated GIF for Android/Windows phones.
*Note iOS with iOS 13 moved where to find the homescreen function. If you are not seeing this as an option, make sure to copy and paste the link into Safari.