How do I remove a wifi network account from iMac? Or how do I encrpyt an open wifi network account to make it secure?

Somehow a wifi network connection  has been created either on my airport router or iMac or iPad which is non secured, I.e. Open. I cannot workout how to delete it or make it a secure connection. My concern is that other users may able to access my computers via this open wifi connection.
What can I do to correct this?

click on the wifi icon and go all the way down to network preference click and open it once you on network window on the bottom right there is a advance icon click that then you should be able to delete all the network that your mac is remember.
hope this is help.

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