Where is the location of the transmission fluid drain plug on a 1993 Oldsmobile cutlass cruiser?

There is no drain plug on the transmission for this car. You remove the pan. It is a messy job, but if you remove all but one bolt on the edge closest to the back of the car, then all from both sides, then just loosen the ones on the front edge, you can slowly loosen the one left on the back edge, and let the fluid run out over the edge of the pan into your drain pan. Once it is drained out, remove the pan and filter, replace both, be careful not to over-tighten the bolts on the pan when you put it back on, . the most common problem in this procedure is cutting the gasket by over-tightening it.