How do i reset my master password on MacBook Pro previously owned by someone else?

I purchased from someone else in 2011 and needed to reset master password.  It was done, but now I am having problems resetting it.  It does not recognize the reset password.  I am trying to add new software and can't do so without password.  Can someone please help me?  I entered to change in terminal window, but when it comes to adding new password, computer won't allow to add new passcode in blank. 

Check out KB Articles http://support.apple.com/kb/HT1274 Changing or resetting an account password and http://support.apple.com/kb/PH11390 OS X Mountain Lion: Reset a login password  if you are using ML.  You never stated which OS you are currently using. 

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