Cannot remember the AdMin password!

My son gave me his old MacBook Pro but simply cannot remember the AdMin password.  I'd like to re-set it with my own but how do I do this without knowing the old one??

Forgot Your Account Password
For Lion, Mountain Lion, or Mavericks
    Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     When the menubar appears select Terminal from the Utilities menu.
     Enter resetpassword at the prompt and press RETURN. Follow
     instructions in the dialog window that will appear.
     Or see:
       Reset a Mac OS X 10.7 Lion Password
       OS X Mountain Lion- Reset a login password,
       OS X Mavericks- Solve password problems,
       OS X Lion- Apple ID can be used to reset your user account password.
For Snow Leopard and earlier with installer DVD
     Mac OS X 10.6- If you forget your administrator password,
     OS X- Changing or resetting an account password (Snow Leopard and earlier).
For Snow Leopard and earlier without installer DVD
    How to reset your Mac OS X password without an installer disc | MacYourself
    Reset OS X Password Without an OS X CD — Tech News and Analysis
    How To Create A New Administrator Account - Hack Mac

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