I bought a used Macbook that came with the OS 10.7 upgrade, How can I reset the admin password?

How can I reset the admin password I don't have the old password. I bought it used and the disk's it came with are OS 10.5 how can i get this password reset without losing any of the upgrades or files?

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 and OS X Lion- Apple ID can be used to reset your user account password.

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