Press and hold the WPS button on the DIR-505 for 10 seconds, then press the WPS button on your router (or see your router’s instruction manual if it does not have a WPS button).

Note: if you press the WPS button on the DIR-505 for less than 10 seconds, the DIR-505 will still enter WPS pairing mode, but in this mode it will connect to a WPS client, instead of connecting to the router.