How do I reset administrater password Mac OSX

My mothers emac was set up by my nephew and I can't install new printer software without password. But it has been forgotten by all. how can I reset it without knowing original?

Insert a compatible Mac OS X install disk, restart with the Option key held down, click on it, push the button with the straight arrow, and use the disk's Reset Password tool. If the computer has a firmware password set, supply it.
(59809)

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