How can I activate my 802.1X again? urgent...

I bought this macbook about 4 months and acidentally changed its setting for 802.1x, so now it is not working. Anyone knows how to activate it? thanks a lot

Authorization
Macs:  iTunes Store- About authorization and deauthorization.
Windows: How to Authorize or Deauthorize iTunes | PCWorld.
In iTunes you use the Authorize This Computer or De-authorize This Computer option under the Store menu in iTunes' menubar. For Windows use the ALT-S keys to access it. Or turn on Windows 7 and 8 iTunes menus: iTunes- Turning on iTunes menus in Windows 8 and 7.

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