How do I remove my admin password on Mac OS 10.3??

Hi, I am selling my PowerMac G4 with 10.3 OS on it, and I wanted to remove my admin password from it. I went to System Preference > Accounts and thought if I just remove the password I entered there, it will work. When I did that first it gave me a warning saying "You did not enter password, sure you... show more Hi,

I am selling my PowerMac G4 with 10.3 OS on it, and I wanted to remove my admin password from it. I went to System Preference > Accounts and thought if I just remove the password I entered there, it will work. When I did that first it gave me a warning saying "You did not enter password, sure you wanna do that" I clicked OK, then it gave me "You cannot change your password to the password you entered" And it reverts it back to the way things were. Does anyone know how I can remove my admin password?? If so plleeasee help this poor soul :(
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