Where is the drain plug for the trans fluid on my 1999 pontiac grand prix gtp 3.8 auto trans please

THERE IS NONE YOU MUST REMOVED THE OIL PAN TO DRAIN THE OIL
DO NOT ATTEMPT ON HOT TRANSMISSION WITHOUT PROPER CARE
YOU COULD GET BURNT!!!
FIRST BACK UP ALL THE BOLTS A FEW TURNS THEN HAVE A CONTINER WIDE
AND BIG TO CATCH THE OIL THAT WILL DRAIN THEN REMOVE ALL THE BOLTS
AROUND 3 SIDE AND LET PAN DRAIN OUT WHILE HANGING ON REMAINDERS
THEN PUSH PAN UP WITH ONE HAND AND REMOVE REMAINDER BOLTS LET PAN DOWN
TIME TO REPLACE FILTER WHILE IN HERE REASSEMBLE IN REVERSE AND REFILL
START ENGINE PUT TRUE ALL GEARS AT IDLE AND RECHECK TOP UP HAS NEEDED

You have to drop the transmission pan to drain fluid.