1992 525i transmissions fluid

[jtom36]

I'm in the process of changing my transmission fluid and filter. I've completed everything and now it's time to put the new fluid back. However, I cannot find anything on how to replace the fluid! HELP! I need to put 5 qts. back in some way. Can anyone out there help me? I understand that I need to use a tube and fill it from underneath. My problem is that I don't have the Bentley book yet and don't know the details about the temperature or if the car needs to be running or what. It's been sitting in the garage for 3 days now. The trans. fluid came out cool and the new will be ambient temp. Any tips or suggestions would be greatly appreciated.