Load Flyheight.com in the Safari Web Browser.
* Installation will not work from Chrome for iOS and this is only for the first step.
Tap the "Share" icon in the middle of the bottom bar.
Select "Add to Home screen" from the available options.
* You may need to swipe the icon list to the right to find it.
Safari will close and the app icon will be added to your home screen. Launch the app once to ensure the install completes successfully.