I forgot my password to unlock my older iMac, how can I log on?
I have forgotten my password to my older iMac—how do I unlock it?
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Please follow the instructions in If you forgot your Mac login password - Apple Support
Also, it would be wise to buy yourself a password manager such as 1Password so you can manage all the logins, sites and passwords we have to keep track of these days. This would be a smart investment!