Originally Posted by JayArr

you could go here
http://www.linksysfix.com/check/HomePage/index.htm

click on netset and then there should be an option for security.

Or go to your routers setup page, click on the wireless tab, select security and change the mode to WEP, and enter a passcode. You also need to make sure your reciever knows the code

Tell me if that didn't help, and i'll put more detail in