Kindle Fire HD / HDX - L2TP VPN
Please note: You need a 2nd generation Kindle Fire HD or the new Kindle Fire HDX to be able to setup the service.
Earlier models lack VPN capabilities.
1. Swipe down from the top of the screen to show 'Quick Settings', and then tap 'Wireless'.
2. Tap 'VPN' and then tap 'Add a VPN Profile'.