Oil strainer guide Auto B13 NIS box

My estimated I have a problem with the automatic box of my Nissan Sentra B13 1994, USA. I decided to change the oil and filter (oil strainer), since I had it for many years and never changed it, let go of the lid and then the filter without any problem, when you eat to screw the new filter the last screw (guide screw or earrier) does not mes Valves does not show anything if you transfer it. I don't know if you have to go down that I don't think because it has to be easy to eat it.
Please if Alguen can help me.