we have a Lincoln LS 2001

there is a large plug in the bottom of the transmission pan with a smaller plug inside of the big one usually a torx head. If you want to check the level it needs to be at operating temp. and in park you have to raise the vehicle and take the smaller plug out, it fluid runs out then it is full. if it does not you have to add some through the same hole there is no way to add it from the top. do not take the larger plug out it will drain all the fluid in the pan

looks like this