Adding security code to exisiting network Windows 7

I have an existing wireless working network with WIN 7 - 2 laptops, two desktop PC's. Can I add a security code/password without setting up a new network? Thanks!
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  1. you should be able to log into your router via your browser and enable wireless security in the wireless tab.

    then under wireless security choose the wireless mode preferred is WPA2 and set the wireless password.
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