Lt. Amazon customer service there is no way to use the license for offense in FreeTime, because the game at startup checks the activation, connection attempts from FreeTime but blocked. Vague hope is the coming FireOS 4 with separate children's and adults accounts and integrated in the account FreeTime.
So just a bad review for the immature model of EA and Amazon remains for me to forgive. One gets the impression that the profit motive has prevailed at the expense of the client's interests. And No, turn FreeTime is not an option - the only reason to buy Galaxy Tab Kindle via eg a Nexus 7 or Samsung.
A great pity, because otherwise a lot of fun.
Update 01/12/2014: In the meantime FireOS 4 is publicly and installed. Unfortunately, there is no change: even under FireOS 4 can not be used in conjunction with FreeTime the paid kick mode. It stays with an asterisk.
Update 01/26/2015: The game spreads through updates and downloads continuously in the Kindle out, it already has more than 2 GB of memory. This has meant that only very few apps have next place, because only about 3 GB are available on the Kindle. Save Warning and archiving requests are thus to weekly routine. The fact remains that Fifa and Kindle are not an ideal combination.