Just to make sure you have the link:
http://www.mahalo.com/Mortal_Kombat_vs_DC_Universe_Fatalities

To do the fatalities, you pretty much just follow the button combo. For instance, the Baracka Chest Stab:
[Towards Opponent] [Towards Opponent] [Down] [Down] then A

You have to do it in fairly rapid succession and make sure you don't hit the directionals at a diagonal. It can be a bit over sensitive, but practice makes perfect! =)

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