This browser can add it in one tap.
Showing the steps for this device first.
Using Chrome on an iPhone? Its Share button (top right) has Add to Home Screen too. If it is missing, open the same link in Safari.
Samsung Internet: tap the menu (three lines at the bottom), then Add page to → Home screen.
Sharing a tablet? Give each person their own icon. Set up one person at a time, and when the phone asks for a name, type theirs (for example “June”) instead of “Porchlight”.