iPhone and iPad
- Open this page in Safari. It has to be Safari, it does not work from Chrome or from inside WhatsApp.
- Tap the Share button at the bottom, the square with the arrow pointing up.
- Scroll down the list and tap Add to Home Screen.
- Tap Add at the top right.
Android
- Open this page in Chrome.
- Tap the three dots at the top right.
- Tap Add to Home screen, then Install or Add.
Samsung Internet
- Tap the three lines at the bottom right.
- Tap Add page to, then Home screen.
It will show up with the CERTAIN CLB logo and the name underneath, next to your other apps. It is not an app you install, it is just a shortcut, so it takes no space on your phone.