How can I access my now locked wifi?

My sister recently got a laptop. When setting up the wifi, she thought she was changing the name and password for her own use on her laptop. She accidentally locked all wireless access to the once unlocked wifi. We have no idea what the password could be. We've tried entering all sorts of numbers but none seem... show more My sister recently got a laptop. When setting up the wifi, she thought she was changing the name and password for her own use on her laptop. She accidentally locked all wireless access to the once unlocked wifi. We have no idea what the password could be. We've tried entering all sorts of numbers but none seem to be working. If there are any tech people out there, your help is greatly appreciated! Thank you :)
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