There is a small pen sized hole on the back of the router. Use a ball point pen to press and hold down the reset button for a bout 15 seconds.
Use the following to set back up your security:
Use an Ethernet cable to connect a computer to any one of the four LAN ports of the NETGEAR router.
In a web browser, enter the router's IP address - either http://192.168.0.1
When prompted for a Username and Password, enter the default username and password (admin; password) unless you have already changed it. NETGEAR recommends changing the default password to increase the security of your network.
Select Wireless Settings from the Setup menu in the left-hand navigation bar.
Under Wireless Network, enter your desired network name in the Name (SSID) box.
Under Security Options, select WPA-PSK [TKIP] + WPA2-PSK [AES].
Under Security Options (WPA-PSK + WPA2-PSK), enter your desired network password into the Passphrase box.
WRITE DOWN or KEEP NOTE of your network name, security option and passphrase - you will require them to connect wireless computers and devices to your network.