I decided to change the transmission fluid and once I had it drained I can't find a place to fill it up? Help!

I presume it's a manual transmission? There should be a hex head allen type plug in the side of your transmission. That's wher you would add fluid. You will most likely have to have a pump of sorts to pump fluid from your bottle of fluid into the hole as there is no room to pour it in.

If it's an automatic, I have no idea.

while it is running and cold fill the tarns hole on the side until starts to come out and lock the hole and your ok