I'm installing a printer on a MacBook Air via USB connected DVD drive.  The computer asks for my password.  I don't hink we ever had one.  Is there a default password ("admin"

I'm installing a printer on a MacBook Air using an external DVD drive via USB.  The computer is asking for my password to authorize changes to the system.  I don't htink I ever put one on the computer and "admin" and "password" don't work.  Is there a default password?  Or a way to change a password that has been forgotten, wothout resetting the computer and wiping everything out?  Thanks. 

Many thanks.  As it happens, I wen to the local Apple Store today for an appointment with a "genius".  She helped me reset the password. And as I look at the screens on the page that you connected me to, they're the same as the genius used.  So your suggesstion was right on the money, and now I'm all set.  Thanks again.

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