How to use Cemu


Is there a trick to using the keys in Cemu.
I have a few games lime Minecraft Stories, Angry Birds, and a few others, that I try to run on Cemu.
However it says they are in need of Keys.
I have found the keys on line, and have pasted them in my Keys.txt in my Cemu directory.
However when I go to run the program in Cemu. I stil get the notation that the keys are still needed.