Next, connect the Kindle Fire to your computer using a Micro-USB cable (shown here on the left). Amazon doesn't include one in the box, so you may need to go out and buy one. They're easy to come by, and you may already have one for your smartphone.
Be careful not to purchase a Mini-USB cable (shown here on the right). The name may sound similar, but the connection will not work in the Kindle Fire's Micro-USB port.