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Question: Change Administrator and password

i was given a used mac desktop, but the previous owner cannot remember his admin id and password. Therefore, I cannot make any changes or keep my files, because I have to work under guest. How can I bypass the old admin and create one for myself?

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You should backup everything that you have in the guest account and then follow the directions

at > What to do before you sell or give away your Mac - Apple Support

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Question: Change Administrator and password