I got my mac from granddaughter.need help to change admin password

i just got my mac from granddaughter. i need help to change the admin password. she has no clue what i am talking about when i ask for the password. please help me. i can't even install my tiger replacement cd until i change the admin password. thanks for your help. lee

Hi, Lee. Welcome to Apple Support Communities.
From this Apple Knowledge Base article:
Start up from a Mac OS X Install disc (one whose version is closest to the version of Mac OS X installed).  Usually, you can start from the disc by putting it in your computer, restarting, and holding the C key. Or, put it in the computer and click the Install or Restore icon you see in the disc's main window (after which the computer will start from the disc without you needing to hold C). Or, you can use Startup Manager or the Startup Disk preference pane to select the Install disc.
Choose a language, click the arrow button to continue,
Mac OS X v10.6 or later: Choose Password Reset from the Utilities menu.
Mac OS X v10.5 or v10.4: Choose Reset Password from the Utilities menu.
Mac OS X v10.3: Choose Reset Password from the Installer menu.
Tip: If you don't see this menu or menu choice, you're probably not started from the disc yet.
Note: The default keyboard layout is U.S. English while started from the installation disc. If you use a keyboard layout other than U.S English, use the Input menu (the flag icon on the right side of the menu bar) to select the desired layout before typing a new password.
Select your Mac OS X hard disk volume.
Select the user name of your original administrator account.
Important: Do not select "System Administrator (root)". This is actually the root user. You should not confuse it with a normal administrator account.

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