Most guys prefer not to hook up the kill switch because it can short out the magneto... but if you still decide to hook it up?, It doesn't matter which kill wires you plug into the blue & black wires (It works either way)
Black is ground and connects to Black.
Connect the blue to the red.
That will get your motor running without the kill switch.
The yellow or green makes a 3 way connection to the black or red/blue connection. Does not matter which color as the kill switch is just grounding the wires.