Forgot my MacBook Air login password?
I Forgot my Apple MacBook Air login account password, is there any way to reset my password?
MacBook Air, OS X Mountain Lion (10.8)
Welcome to the Apple Support Communities
If you have forgotten your password, first try resetting it with your Apple ID > http://support.apple.com/kb/HT4798?viewlocale=en_US&locale=en_US
If it doesn't work, see > http://discussions.apple.com/docs/DOC-4101