How do you accuratley check the transmission fluid in a 2002 Chevy Cavalier on 2002 Chevrolet Cavalier

I have been told that you pull a plug in the front of the transmission and pour fluid in the top until it comes out, I ended up pouring a whole liter into it and still nothing came out. i am afraid to overfill it and cause something to fry. I do not see why Chevy couldn't just do like every one else and put a dip stick on the tranny

Asked by for the 2002 Chevrolet Cavalier