How do I delete a 'trusted network'?

Somehow I have a 'linksys' as one of my trusted networks and if my own internet isn't hooked up, it will pick up this person's signal.
I don't recall ever okaying it (I may have clicked something by accident) and now I can't figure out how to 'untrust' it without resetting everything. I don't know how to reset it anyhow.
I WOULD just like to delete that specific network. It makes me very nervous to have my computer signing on with some random guy's internet without my okaying it. Is there a way to delete one trusted network?

HI,
Open System Preferences/Network. Make sure Airport is selected on the left. Click the Advaned tab.
Where you see network names, highlight the network(s) you don't want used the click - (minus)
No one can use your internet connection without your network password. It's encrypted.
Carolyn

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