where to add transmission fluid

down the spout where the transmission dipstick is

i assume you have an automatic transmission, for a manual transmission there is a plug on the side of the case

if its a manual tranny don't put tranny fuild in it !! gear oil .

For the automatic transmission. It is hidden by the battery look down to your right beneath the maf sensor. Taking out the air filter/ box helps. has a red cap and there is a plug on the tranny that you unplug. fill the tranny and the plug will drain when is full.