Read the netgear manual. Plug a pc into the network port on it and see if assigns an IP. (192.168.x.x). If it does, open a browser window on the pc and type in the same address as your IP, with 1 as the last digit (192.168.x.1) (the x is going to be custom to your setup).
If done correctly this will bring up a browser login to the netgear router. Finding the default login on the web or in the manual, you should be able to login and tell it which network to log in to, and adjust all the other settings.
I'm not sure what your level of comfort is in this. The WDS606 is designed to connect to a wireless router and provide 4 ethernet ports for devices on the network as well as 2 usb printers to be shared. Once you get the netgear device to reside on your network you'll still need to configure a network amongst your pc's in order to see them all.
First step, find the manual on the wps606. If you're having issues past logging into it, get back with the forum here. I have one I can plug in and test any issues you're having. I found it pretty simple to set up, I think once you log in to it you will to.
I 'believe' it came with some setup software on a cd too originally, that might still be available on netgears site.
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