Thanks for your reply James. After a lot of trial & error, since I could find no you tube, ESRI online help, or mention within one of the few ESRI online courses:
one sets up either rapid or 2D products to process. In the set up insure that the DTM, DSM, & Contour boxes are checked on - a contour shp file is produced and appears in a new folder within the products folder [the shp file is likely stored in the path specified by James]
I couldn't produce contours into an existing products folder; had to process from scratch
Ken