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The manual relief valve should not leak. To inspect and/or replace its o-ring, screw the valve all the way in. Remove the snap ring. Unscrew the valve and it will come all the way out.
To fill the system: Lift the motor completely up and engage the tilt lock. The oil reservoir is on the right, the trim motor is on the left. The fill plug is about 1/2 way up the reservoir. Fill the reservoir with fluid up to the plug and install the plug but don't tighten it. Disengage the tilt lock. Cycle the system all the way down and all the way up. Refill the reservoir. Repeat through at least 5 complete cycles. The oil should be up to the plug with the trim and tilt cylinders completely extended. Tighten the plug when the system is full. "Dexron ATF" is the proper oil to use.
Hope this helps.