Sorry, just saw this this morning, I wasn't ignoring you, just slow. The fill hole is in the side of the transmission just behind where the driver's side axle goes into the tranny. You can see it best by removing the driver's side front wheel and looking in from the wheelwell. There's a pretty good picture of it about halfway down this page:
http://www.teamswift.net/viewtopic.php?t=11004 It's usually a headless plug with a square recess in it that an extension with no socket fits into. There's another just like it on the bottom of the tranny case. Make sure you can get the fill plug out before removing the drain plug. In a pinch, if you can't get it out at all, you can drain the transmission completely (let it drip for at least an hour) and then put exactly 2.5 quarts in from the hole in the top that is discussed in that same thread.