transmission fluid

yes and it's best to use a funnel. make sure the fluid type matches the car manuals specs or you may find yourself having more problems than just trying to find the fill point.

yes,you can fill the tranny up there using a smallended funnell. but be carefull,not to overfill.and allow the transmission to warm up before topping off the fluid level.

Yes that is where the Transmission fluid goes.

yes in the transmission dip stick. read it according to writting on the stick itself.