Netgear WNR612 does support WPS but the router does not have a physical WPS button. It only has Soft WPS button which you can only access after you login to the router.
So its not easy to use WPS on Netgear WNR612 router. Unlike some routers it lacks a physical WPS button. To use the soft wps button, you will have to login to the router administration page by accessing routerlogin.net and then click the Soft WPS button which can be found in the advanced section.
If you want to access the administration page, you should already be connected to the router i.e., you need one device to access and click the soft wps button to setup wifi on a second device. The process is cumbersome and it is far better and easier to setup wifi directly on the device in need(ofcourse you should remember the password).