Open a web browser like internet explorer or Netscape. Enter the ip address of your router in the address bar of your browser. In the picture above the address bar has http://www.google.com in it. Just replace all of that with the ip address of your router. By default the ip address should be set to 192.168.1.254.
I do not know the default username and password for your router. If you know them, please use our Comments page to let us know what they are. Thanks!
Click the Configuration button near the left side of the page.
You should now see a new menu. In this new menu, click LAN.
You should now see a new menu. In this new menu, click Wireless.
Click the Wireless Security button near the left side of the page.
When you're finished, click Save Config to FLASH near the left side of the screen to save your changes. And that's it! You're done!