It's an easy process. Hope this helps.

This is the easy way. The link is for those who don't have
the install CD.

Reset Mac Password – with the installer CD/DVD Resetting a forgotten Mac password is easier if you have an installer disk handy

Boot from the Mac OS X installer disk by inserting it into the Mac and holding down the “C” key on boot

Select your language preferences and then under the “Utilities” menu select “Password Reset” (it may say “Reset Password” instead, depends on the version of Mac OS X)

Select the hard disk that the forgotten password is on, then select the username of the forgotten password, you’ll then be asked to select a new password

Reboot as usual from the hard drive, using your newly reset password as the login!

Forgot Mac Password? How to Reset Your Mac Password (with or without CD)

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