Takes about 15 seconds. Follow the steps for your phone below, then tap the button to open the app.
iPhone (Safari)
Tap the Share button at the bottom of the screen — the square with the arrow pointing up.
Scroll down the menu that pops up and tap it.
Tap it in the top right corner. Done.
Android (Chrome)
Tap the three dots in the top-right corner of the screen.
Tap it in the menu — or tap the install banner if you already see one at the bottom.
Tap it to confirm. Done.