1. Open Keychain Access, which is in the Utilities folder of your Applications folder.
  2. Choose Preferences from the Keychain Access menu, then click the Reset My Default Keychain button in the preferences window. After you enter your new password, Keychain Access creates an empty login keychain with no password. Click OK to confirm. (If you don't see a Reset My Default keychain button, close the preferences window and select the “login” keychain from the left side of the Keychain Access window. Press the Delete key, then click Delete References.)
  3. Choose Log Out from the Apple menu to return to the login screen.
  4. Log in to your account using your new password. Your account password and login keychain password now match again.