Own a Nook? You can read Kindle books! This article explains more and
HERE are some directions from Amazon:
How to download the Kindle Reading app to your device.
The Kindle for PC app can be used on any computer running Windows 7, Windows 8 or 8.1, or Windows 10 in Desktop Mode.
To download and install the Kindle for PC app:
Note: Kindle for PC applications running a software version below 1.14.0 are no longer supported. If you are running an operating system that is not compatible with our app (for example, Windows RT), you may continue reading from your computer with Kindle Cloud Reader.
Kindle for Mac can be used on any Apple Mac computer running OS X 10.10 or higher.
To download and install the Kindle for Mac app:
The latest version of the Kindle for Android app can be installed on Android devices running OS 4.4 or higher. Devices running Android OS 4.3 or lower get an option to download the last compatible version from the Google Play Store or Amazon Appstore. Android devices that do not have the Google Play Store preinstalled may not be supported.
To download and install Kindle for Android from your device:
The latest version of the Kindle for iOS app can be used on iOS devices running iOS 11.0 or higher. If your device is running an earlier iOS version, you have the option of downloading the latest compatible version of the Kindle reading app.
To download and install Kindle for iOS from your device: