To purchase an app from the Amazon Appstore for Android through your Android device, first download the Amazon Appstore for Android to your phone and set up your 1-Click payment settings

Tap the Amazon Apps icon to open the app. You'll immediately see the Free App of the Day and What’s Hot apps, as well as lists of New and Bestselling apps. You can also find apps in the following ways:

Click the “Buy App” or “Get App” button to download an application. The application is added to the My Apps page within the Amazon Appstore for Android app on your Android device, and automatically installed.