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Hello. My name is***** bottom screw is not a vent screw is the manual tilr release screw. The correct way to add fluid it to tilt the motor to the full up position. Then fill the reservoir with fluid till flows out fill hole. Replace plug run the trim down then back up. Run through the cycle a couple of times. Then tilt motor all the way up and check fluid level again. Add fluid if needed.
Now if you can't tilt the motor up you open the bottom screw 3-4 turns CCW raise motor by hand with help of a friend. Once engine is tilted all the way yo tighten screw.
Do you follow this procedure?