How do I Bypass the Admin password on a mac to reset it if forgot password?

My own sister offered my babies her old Mac working Mac OS IN THIS HANDSET X type 10.SOME.11.It requires updated to perform Itunes and also firefox most current version Unfortunatly your lover put a passwrod on it along with she doesnt remember it.Sois there a better way just to be able to reset for you to defult or even crackthe password.

Heres how to create an admin accounts without knowing existing administrator password.

http://www.macpassword.com/mac-admin-hack.html

Here would be the directions that will reset the password, straight from the apple company:

http://support.the apple company.com/kb/ht1274

You require your OSX assembly discs unless you have having access to any officer account in that computer system.