To download a manual for the Amazon Kindle, visit Amazon.com. Scroll to the very bottom of the page, and click Help. Mouseover Amazon Devices, and select Kindle Devices. In the Learn More category, click Fire & Kindle User's Guides. Choose the appropriate model, and open the desired PDF manual.
Amazon offers a user's guide, a quick-start guide, and guides in other languages for most Kindle models. To update the current user manual for your Kindle, download the AZW file for the appropriate Kindle model. Connect the Kindle to your computer via USB cable. Find and copy the AZW file, and paste it to the documents folder on the Kindle.