How to create a wifi network with macbook.

How to create a wifi network with macbook? I dont have wifi for my itouch. I am trying to create a wifi through my macbook for my itouch. does anyone know how that works? thanks

Open the Sharing pane of System Preferences and enable Internet Sharing over AirPort.
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    Open the Sharing pane of System Preferences and enable Internet Sharing over AirPort.
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