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Be sure that you first install the software and drivers before ever plugging in the Wi-Fire, and also that you have gone to System Preferences, opened the Network Settings Pane and allowed the computer to find the hardware.  This is successful if an “Add New Port” dialogue box opens, and you click Apply Now to apply the changes.  If the dialogue box does not open automatically when you click on the Network Settings pane, you should select the “+” to add it manually.