Where to fill up transmission fluid
 

I am planning do to change my solenoids this weekend ( hopefully), so I crawled under the car today to take a peek at the tranny oil pan.
I see the drain plug/pan bolts ( pretty straight forward). But don't see a place to refill the tranny fluid. Do I pour it thought the dip stick tube in the engine bay or is there another tube/hole somewhere?

wrong section sorry, mods please move.