It only takes about 30 seconds, and there's nothing to download from an app store. Just follow the steps for your phone below.
You'll now see the Canopy star icon on your home screen, just like any other app. Tap it any time to open Canopy — it'll open full-screen, without Safari's address bar.
Some Android phones will even show a small banner or pop-up suggesting you install Canopy automatically when you visit the site — if you see that, you can tap it instead of going through the menu.