merhama Said:
"I cannot open my McBook: I change apple id password"
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Reset the Forgotten Mac Password:
A. Where to Reset it:
Reset it using the login screen. You'd go through your Apple ID to perform this. Find out more here: If you Forgot your Mac Login Password - Apple Support. Make sure that caps lock is not enabled when typing it.
B. Troubleshooting the Reset:
Go here, if having issues: If you can't Reset your Mac Login Password - Apple Support
C. Learn from This:
Important: Keep a handwritten, hardcopy list of your passwords. Store it in a secret location that only you are knowledgeable of, and only you have access to. And, on top of that, don't share you passwords with anyone whomsoever.