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Remove a passkey or password from your Mac and iCloud Keychain
On your Mac, choose Apple menu
> System Settings, then click Passwordsin the sidebar. (You may need to scroll down.)
Click the Info button
for the website.
Click Edit.
Click Delete Password or Delete Passkey.
Click Delete Password or Delete Passkey (again).
Note: Although the password or passkey is removed from your Mac and iCloud Keychain, you can still sign in to the website or app.