This would be a starting point.. I cannot see the later articles..
But the method is basically the same..
I have only done it using the manual method.. ie plug the printer into a computer by USB.. and run through the setup wizard CD.. supplied with most printers.. to set them to infrastructure mode to the wireless of the TC.
It works fine for all the printers i have tried.
So read the instructions for the printer for Mac installation.
Just to add .. here are the details for WPS which is far from obvious in the Apple routers.
It is not necessary to use WPS but almost all printers made today will use it as so called easy way to get password and wireless details transferred.. it is actually a big fat security hole.