I assume it is the same for my 96 Impreza, but when I changed mine, I poured it in where the transmission dipstick was through a funnel
Pull the dipstick out, put a funnel into the tube where the dipstick was, open transmission fluid container, pour.
only if they make one
In the transmission.
You put the Transmission Fluid in the Transmission (fill point transmission drip stick tube)
Yes.
No, I can't.
The transmission will fail.
Low Transmission fluid
Buy a transmission funnel and pour the fluid in the dipstick tube.
In the transmission.
In the transmission!
The transmission fluid is added where you check it, on the toppish left (driver's) side of the transmission.