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I can't give you a picture, but it is about as obvious as the engine's drain plug. If I'm remebering correctly, the drain bolt has a perfectly round head, with a 3/8" square hole in it. To remove it, you just use a 3/8 ratchet without a socket. The fill plug is directly above (couple inches) the drain plug. You will not be able to use a funnel to fill the tranny. The best way to get it in is with a pump.
The large nut is fill (17mm) and the lower four point is drain (3/8"). You will have to pump it in. There is no fill point from the engine bay. Just make sure you can get fill nut off first before draining. I just changed mine to Redline MT-90 and shifting is much better.
To pump the fliud in, I used a "suction gun" purchased at a Car Quest Autoparts store.
It looks like the barrel of a grease gun, with a flexible plastic tube coming out of one end. You pull back the rod coming out the other end to fill it, then push the rod in to squirt it into the transmission. The one I bought cost about $12 (US). It only holds about 1/2 quart, so I had to fill it several times to fill the transmission. The thing is made of metal and should outlast me. Others have used different solutions, but this was available, affordable, and has worked for both the transmission and the differential.
You need to buy 2 (at almost $10 US each) quarts of Synchromesh to get the job done, although someone earlier suggested a third in case there's a spill. The transmission holds about 1.6-1.7 quarts (US).