Another way of filling Nissan Plate?

Greetings.
I want to fill in the automatic transmission of a Nissan Platina. In advance, the different ways of filling an automatic transmission, but these cars are complicated and children and I would like if someone can give me specific information about this transmission.
Apparently it has a plug at the top, next to the shore the gear cable (which already identifies and mentions a manual that finds here.) The problem is that it is under the cable and I need to remove it to remove the plug. I realized that just right now, the gear cable is screwed from is also a kind of flexible plastic tube (level hose type) with a plug that can be easily removed and is also as connected to automatic transmission and apparently it has oil marks. I do not find anywhere in the service manual mention any of this tube, but I want to assume that it also serves to fill the transmission. Someone can get me out of doubt if this tube serves to fill the transmission or flat will have to remove the plug that is under the gear cable.