Either on the bottom or side of the router or in the instruction manual there should be an address that you can see to type into the browsers address bar. I think Netgear is the 192.168.0.1 and once you type in that address you will see the login box on your screen where you put the default user name and password. You then go to the security tab and create your password and you can encrypt it if you want then make sure you write it down for safe keeping and save and exit. Now you have your password setup.
1)Open the web browser that you use: Firefox,Google Chrome,IE,or Opera and type in the IP address for your router,and press the Enter key. http://www.routeripaddress.com/< Router ip addresses can be found here
2)A window will open and then type in your routers default username and password,and press the Enter key again http://www.routerpasswords.com/< Router usernames and passwords found here ***** Username and Password may also be located on the side or bottom of your router *****
3)Navigate to the Wireless Security\Network Security Settings Tab and open to locate or change your WEP or WPA Security Passphrase. Use WPA because it provides better security.
4)Write this Security Passphrase down and put it in a safe place to access when needed.