I agreed with smorizio. To clarify, he means the default username for Netgear routers is "admin" without the quotes and the default password is "password"
To reset the router, just press and hold the button and keep it held for 10 seconds. After it restarts, plug an ethernet cable into it and the other end into the ethernet port on your computer and wait 1-2 minutes for it to get an IP address.
Next, open a web browser (Firefox, Chrome, or Internet Explorer) and find the http://(whatever.com) box. Delete everything in that box and type in "192.168.1.1" without the quotes and press enter. You can then enter in the username and password I gave you above and reconfigure the router!