KLT Profit installs straight from your browser: no app store, nothing to download. About 30 seconds, and it opens full-screen like any other app.
Open app.kltprofit.com in Safari (it has to be Safari for this part).
Tap the Share button at the bottom of the screen, the square with the arrow pointing up.
Scroll down the list and tap Add to Home Screen , then tap Add.
Already had a KLT Profit icon? Delete the old one so you only keep this new one. The old one is the one that shows a "new address" message when you open it.
Open app.kltprofit.com in Chrome.
Tap the three dots in the top right corner.
Tap Add to Home screen (some phones say Install app), then confirm.