Thanks so much for responding. While there is nothing in the documentation to explain what else you have to have checked to make sure that the Discount Code will work in the Promotions area, I found out that you have to uncheck ignore discounts in the Catalog settings for this to work. It seems that nop comes out of the box with this checked. If it is checked, no discounts will populate the system. That should be in the documentation for Promotions
Thanks for your help.