The Kindle App can be used on any iPad, iPhone, or iPod touch with Firmware 3.0 or higher installed.

Installing the Kindle Application

To access your Kindle library and shop for Kindle books at Amazon.com from your iPad, iPhone or iPod touch, you'll need to visit the iPhone App Store and download the Kindle application.
To install the Kindle application:

1. Visit www.apple.com/iphone/appstore/ by tapping the App Store icon on the home screen of your iPad, iPhone or iPod touch. You can also get the application through the iTunes Store.
2. Search for "Kindle" or find it in the alphabetical list of applications.
3. Follow the on-screen installation instructions.

When your installation is complete, simply tap the Kindle icon on your device to start accessing or building your Kindle books library.
Managing Your Registration

To register the Kindle application and access content from the Kindle store, you'll need to have an Amazon.com account. Amazon.com recognizes most accounts established with our non-U.S. sites. If you live outside the United States and use the Kindle application, please see the Using Kindle for iPad/iPhone if You Live Outside the United States Help page.

Logging into your Amazon.com account through the Kindle application registers your device to your Amazon.com account and gives you access to your existing Kindle Library.

After you log into your Amazon.com account for the first time, you never need to log in again from your iPad, iPhone or iPod touch. Every time you access the Kindle application, you'll be instantly connected to your Amazon.com account and can access your Kindle library.
To register with your Amazon.com account:

1. Enter your Amazon.com account e-mail address and password when you first launch the Kindle application.
2. Tap the "Register" button.

You can also tap the "i" icon on the Kindle home screen, to access the Info screen and view or change your account registration.
Signing Out and Deregistering

When you "sign out" through the Kindle application, your device is deregistered and will no longer be automatically associated with your Amazon.com account. When you deregister, no additional content can be downloaded or purchased from your Amazon.com account using the Kindle application until you register again.
To deregister using the Kindle application:

1. Tap the Kindle icon on your iPad, iPhone or iPod touch.
2. If you're not on the Home screen, tap the Home button.
3. Tap the "i" icon in the lower right-hand corner to visit the Info screen.
4. Tap "Registered to . . ." at the top of the screen.
5. Tap the Deregister button.

To deregister online:

1. Visit the Manage Your Kindle page on Amazon.com.
2. Locate your device in the "Your Computer and Other Mobile Device(s) " section.
3. Click the "Deregister" link.

Setting Your Kindle Payment Method

When you buy books or other items directly from the Kindle Store on your iPad, iPhone or iPod touch, you're paying with the Default 1-click Payment Method on your Amazon.com account. Typically, this is the payment method associated with your default shipping address. For digital purchases, you can use a credit or debit card or Amazon gift cards.
To check or change your payment method:

1. Visit the Manage Your Kindle page.
2. Click the "Your 1-Click payment method" link in the shortcuts on the right-hand side of the page.
3. Click on "edit" to update your payment method, then follow the on-screen instructions for choosing or adding a payment method.
4. Click the "Continue" button to verify your changes.

Updating 1-Click Settings for Gift Card Purchases

You are not required to have a credit or debit card on your Amazon.com account to make digital purchases such as Kindle books, but you must establish a default 1-Click billing address on your Amazon.com account to use Amazon.com gift cards for digital purchases. If you don't already have a 1-Click billing address on your account, follow the instructions below to add an address without entering a credit or debit card to your account.
To add a 1-Click Billing Address for Gift Card purchases:

1. Visit the Manage Addresses and 1-Click Settings page in Your Account.
2. Click the Enter a new address button.
3. Enter the address information and click the Continue button.

Set the address as your default by clicking the link on the address labeled "Click here to make this your 1-Click default address." You may be prompted to associate a credit or debit card with the address, but entering one of these payment methods is not required.
Entering Amazon.com Gift Card Claim Codes

You must first enter your gift card claim code into Your Account so the balance is available for use. The funds the will then be applied automatically to your next Kindle book purchase from the Kindle Store.
To add a gift card balance to Your Account:

1. Visit the Your Account page.
2. Click "Apply a Gift Card to your account."
3. Sign in with your e-mail address and password.
4. Enter your claim code and click "Redeem now."

Visit www.apple.com/iphone/appstore