iOS - Safari

1. Tap the Share button (the square with an upward arrow).
2. Scroll down and tap Add to home screen.
3. Tap Add.

The icon is now shown on your home screen.

Android - Chrome

1. Tap the Menu button (the three dots in the top right).
2. Tap Add to home screen.
3. Tap Install.

After a short wait, the system confirms it, and the icon is now shown on your home screen.