What exactly are you asking here? Have you lost the total wifi card connection? if so, pop open the bottom, unhook the connectors if you can see them, and re connect them. if not, wait until you get home, and disasemble it, take many photos so you can remember the way it was put together, and reconnect them, or look for a fried card. if it's fried, or something like that just buy a new compatible one. if that doesn't work, message me, and i'll go to fix # 2 best of luck
Before you start disassembling your MacBook, try resetting the parameter RAM, and if no better result after that, try resetting the System Management Controller. These might not work, but they are much less invasive than a hardware repair, and they will not damage your MacBook.
If it turns out you do need a repair, contact Apple using www.apple.com/support/contact if you are in a country that supports it or call the appropriate phone number on this page. Alternatively carry the MacBook in to an Apple retail store or service provider to ask for an estimate.
Best of luck.