The correct answer is, that you are not supposed to in any way, shape, or form.
ONLY THE DEALER IS TO TOUCH OR WILL EVER BE TOUCHING THE FLUID IN THAT TRANSMISSION.
This is not them ''screwing you out of working on your car''. It is not meant to be serviced outside of an actual factory dealer repair. AT ALL.
And, it is again, literally illegal for you to touch that (or anything else on your car) if you are not a factory certified tech.