How do I replace the clutch on a 1994 Honda shadow?

Try here, you have the same clutch as 86 model. http://www.hondashadow.net/forum/72-technical-discussion/102963-86-vt1100-clutch-wont-engage.html

Unscrew the screw on the slave cylinder (it is under the plastic cover on the left back side of the engine), squeeze the clutch lever and the oil should come out at the screw center.
If you want to change the oil, open a master cylinder, suck the old oil out and re fell it with new one and go with procedure as described above.

Turn the outer shifter 1-2 teeth to right or left

Check if clutch plates are sticky, and check the clutch slave cylinder operation. If plates are sticky, put them in engine oil over night.

It is def the clutch.

engine stuck

Hydrolic failure is caused by mixing hydroscopic (DOT3) with petrolium based (DOT5) ater and oils don't mix. Blockage at return port won't allow fluid to return to master cylinder. Clutch will not engage if this were the case. The leak would be your best tell. Not knowing exact leak location it would be hard to say. inspection of master cylinder plunger seals couldn't hurt. If dissimular fluids have been mixed all rubber components have been contaminated and must be replaced