Look on the bottom of your Netgear router. There should be the default settings listed including IP address (usually 192.168.0.1) and the login and password for the router. If you connect your Mac to the router directly via an Ethernet cable and type the IP address into your browser you should be prompted with a login box. Enter the default info found on the bottom of the router. Now you will have access to all of the Netgear's settings and configuration wizards. Go ahead and set the router up.
One note: some Netgear routers need you to type the following instead of the IP -
http://www.routerlogin.com/basicsettings.htm
That should work if you are only presented with automatic setup when you type in the IP.
Let me know if you have any more troubles configuring the router.
Cheers.