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If you want a hard-copy, then you can buy it from here --> http://www.amazon.com/Kindle-Fire-HDX-For-Dummies/dp/1118772652
If you want soft-copy, then you can download it to your computer from here --> https://s3.amazonaws.com/kindle-fire-updates/Kindle_Fire_HDX_Quick_Start_Guide.pdf
You can also access the User Manual from your device itself. Turn it on. Swipe down from the top of the screen and tap Settings. Tap Help, and then tap User Guide.
Additional manuals can be found here --> http://www.amazon.com/gp/help/customer/display.html?nodeId=201303400
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