TIP: This procedure can be used to change wireless credentials, passwords stored in programs, website passwords, etc.

1. Open the Keychain Access app. The best way to do this is by using Spotlight.
   
   
   
   
2. If prompted to manage your passwords in the Passwords app or in System Settings, click Open Keychain Access.
   
   
   
   
3. If prompted for authentication, type your user account password and click OK. Alternatively, you can authenticate using Touch ID.
   
   
   
   
4. The list of stored credentials will be shown. If Keychain Access is locked, click the lock icon in the top left-hand corner and enter the appropriate credentials to unlock it. To modify an item in the keychain, double-click on its entry in the list shown.
   
   
   
   
5. The attributes for the keychain entry will be displayed. To change the password that is stored, click the checkbox next to "Show password".
   
   
   
   
6. Type the username and password of an administrator account. Then, click OK.
   
   
   
   
7. Type the username and password of an administrator account. Then, click Allow.
   
   
   
   
8. Your stored password will be displayed. You can update this password so that it is current. Once you have updated the password, click the Save Changes button.
   
   

Outcome

The stored password has been updated in Keychain Access.