TP-Link TL-WPA4220KIT AV500 Powerline Wi-Fi Booster

The blurb says 'No configuration required'. However, I suspect that they assume the main router has a WPS button - am I correct here? - The Netgear DGN2000 doesn't have a WPS button. If WPS button is not essential, how does one set up the powerline kit using a Netgear DGN2000 router as the main ISP connection point?

I'm running Windows 7 Home Premium on an Acer laptop; iPhones (2) and an iPad in the room where I want the wifi signal extended.