How to reset or retrieve my forgotten iMac password
I am trying to delete some old files in my old iMac finder and it’s asking for my password. I have no idea what it is. How can I either retrieve that information or reset it?
Follow the instructions here. It goes in progressive order where the last option is for when nothing else works and will allow you to reset/wipe your Mac.
If you forgot your Mac login password - Apple Support
