No doubt the WPS implementation on the AirPort routers is a bit lacking but it does exist. To access it, you would need to use AirPort Utility v5.x.
AirPort Utility > Select your Extreme > Manual Setup > From the utility's menu bar, select Base Station, and then, Add Wireless Clients. You will then be presented with the Wireless Client Setup Assistant where you can choose one of two WPS methods that the AirPorts support.
You are correct in that you cannot install v5.6 on an OS X Mountain Lion machine, but it will run just fine once it has. The trick is to extract the AirPort Utility from the disk image file using a utility like CharlesSoft's Pacifist.
I do appreciate your response, but it kinda goes back to my original post-- I am not programmer or geek (NO offense intended, we all need geeks and they're generaly very nice folks)-- I use apple because it works-- now I need to do work arounds and install old software through a third party vendor.....
I think I'm just gonna get a new, non-airport, router. Their speeds are faster and connectivy is simpler.
I hated typing that. I love Apple, but this is just isn't what I signed up for.