Change the password for a website or app on Mac
You can change the password you use to sign in to a website or app.
Go to the Passwords app
on your Mac.Click All in the sidebar, then locate the account for the website or app.
Select the account.
Click Edit.
Click Change Password, then change your password on the website or in the app.
If the website or app allows you to use a passkey or to upgrade to Sign in with Apple, you can take advantage of the security and convenience of those features. If you aren’t given the upgrade option when you change your password, many accounts allow your Mac to automatically create a strong password that you don’t have to remember.
Note: If a warning appears about a password for a website or app that’s no longer available, you can remove its account from your Mac and iCloud Keychain. Go to the Passwords app on your Mac, click All, then swipe left on the account.