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 192.168.1.253.
You should see a box prompting you for your username and password. Enter your username and password now. By default the username is root, and the password is 1234. Click the Ok button to log in to your router.
Click the Wireless link near the left side of the page.
You should now see a new menu. In this new menu, click Access Control.
When you're finished, click Apply near the bottom of the screen to save your changes. And that's it! You're done!