iPhone
Navigate to the website via Safari.
Tap the share icon (square with up arrow) in the menu bar.
Scroll down the list of options*, then tap Add to Home Screen.
*If you don’t see Add to Home Screen, scroll down to the bottom of the list, tap Edit Actions, then tap Add to Home Screen.
Choose a name for the website shortcut on your home screen and click Add when you're done.
Android
Navigate to the website via Chrome.
Tap the menu icon (3 dots in upper right-hand corner) and tap Add to home screen.
Choose a name for the website shortcut, then Chrome will add it to your home screen.