What can I do w/ a Kindle Fire HDX?

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http://forums.androidcentral.com – Hi, I bought I Kindle Fire HDX 7" off craigslist, apparently was stolen, have contacted Amazon they have it marked as cant be used/stolen/misplaced??? Can I use it or am I out of the money, I bought 2 from same person 1 is fine other one cant be registered w/Amazon cannot contact orginal seller, was a gift now one son will be without if I can't figure out a way to use it. I hear you can root it but I really don't know how or even what that means. Thanks (HowTos)