1998 Chevrolet Cavalier Manual Transmission

What is your question?

The repair manual states to drain the transmission fluid, replace the oil pan, and then refill with new fluid through the 'fill vent tube'. Unfortunately it does not state where to find it, or what it looks like. The closest thing I can find is a single bolt on the top of the transmission that does not seem to hold any other parts together. Could this be it? The repair manual does not state what size the bolt is, or even mention it, so that is another unknown. It looks to be either a 3/4 inch or 11/16th bolt. Any advice will be much appreciated.