Go to the Amazon App Store for Android
Tap the Download Bookshelf button to be taken to the Bookshelf download page in the Amazon App Store.
Tap the Free button, then tap the Install button. You may be prompted to sign in with your Amazon ID.
For Assistance with your Amazon ID please visit the Amazon Password retrieval page.
Once Bookshelf has been installed on your kindle fire, tap on the Bookshelf icon to launch Bookshelf. Sign in with your Bookshelf ID and password.