WPS is disabled by default on the NVG510. You are much better off connecting to the wifi via WPA/WPA2. If your printer only supports WPS then you quill need to go to »192.168.1.254/
and turn on WPS in the NVG510.
Link to NVG510 manual »www.ron-berman.com/wp-content/up ··· nual.pdf
Save to yourself a lot of time and frustration: if the printer is near the modem just plug it into a LAN port and you can still print to it wirelessly because it's on the network.