Does anyone know how to unlock a computer that my kids changed the admin username on and they can't remember what they put

i am trying to unlock my son's computer that we bought from a school supply store. one of my kids changed the administrator user name but they can't remember what the changed it to. the computer is stuck on the login in screen and the password is blank. please help

If you have the OS X installation discs for this computer, then I suggest you erase the hard drive and install a fresh copy of OS X so you can set up an admin account only accessible to you. Create separate managed user accounts for each of your children.
This will prevent your children from making any changes to the accounts of their siblings since you will retain the only authority to make such changes. This would be accomplished through the Parental Controls options of Accounts in System Preferences.
If you need help with this let us know.

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Authorization and Deauthorization
Macs: iTunes Store- About authorization and deauthorization.
Windows: How to Authorize or Deauthorize iTunes | PCWorld.
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Does anyone know how to unlock a computer that my kids changed the admin username on and they can't remember what they put

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