The WPS button is what allows the printer to be recognized by the router. Sometimes it's a real hardware button and sometimes it's a software button. The instructions got your router/AP will tell you.
This may help: http://usa.canon.com/app/html/web_tutorial/WiFi-MX870_350/
Its pretty generic.
John Hoffman
Conway, NH
R6 Mark III, M200 (converted to infrared), RF lenses, Pixma PRO-100, Pixma TR8620a, Lr Classic
