sgbiii Said:
"Unknown Administrator Password: The last administrator didn't pass on the administrator password used in setting up the iMac and MacBook Pro not the user accounts the Administrator password. Can see the user ID but the password is unknown, Help!"
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Deleting the Account:
Why would you want to use someone else's account? Seems like a hack, on your part. If a used device, then I'd say be honest about it and just delete the account. What I would recommend is backup up your Mac today. Once backed up, proceed with deleting that user.
Backing Up the Mac First:
What I would consider doing is creating a backup of your Mac prior to deleting this current user? That way, you can have something to restore your Mac from, should anything go working afterwards. It is always important to backup your Mac prior to making any major change to it, such as an update installing or a user deletion.