The lack of the menu item is a bug in the latest Moneydance build. However if you scroll to the very right of the Moneydance Windows there should be a enter license button within the blue bar at the top of the screen.
Thank you DWG. Subsequent to my request for help, I stumbled across the
same solution by accident. It’s strange that the misleading instruction has
been left in the introductory email for registration.