Install The Ledger
It runs from your home screen like any other app — full screen, its own icon, no address bar. There is no app store and nothing to download.
iPhone and iPad
Open ledgerclub.app in Safari. Tap the Share button — the square with the arrow coming out of it — then scroll down and tap Add to Home Screen.
It has to be Safari. Chrome on an iPhone cannot add things to the home screen, because Apple does not let it.
Android
Open ledgerclub.app in Chrome. Tap the three dots in the top right, then Install app or Add to Home screen — Chrome words it differently depending on the version.
Computer
Chrome and Edge both show a small install icon at the right-hand end of the address bar. It works the same way, and the app opens in its own window.
Afterwards
Sign in once and it stays signed in. Updates arrive on their own — there is nothing to reinstall, because the app is the website.
To remove it, delete the icon the way you would any other app. Nothing about your clubs or your history changes; you can still open ledgerclub.app in a browser and sign in.