how to password protect my wireless network?

i have leopard, and i notice people leeching off my wireless, cause they are showing up in my network, how do i go about password protecting it so that they can not leech off me?

Mydel said:

Starting with a password would be something
Just go to the router settings and enable password protection

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uh , where is that? im looking through out my system prefs and see nothing about my wireless router.

skunk said:

You have to log in to your router, using your browser. Try entering 192.168.0.1

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got it ,thanks.