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1. Open Keychain Access, which is in the Utilities folder within the Applications folder.
2. From the Keychain Access menu, choose Preferences.
3. Click General, then click Reset My Default Keychain.
4. Authenticate with your account login password.
5. After you enter your new password, Keychain Access creates an empty login keychain with no password. Click OK to confirm.
   1. If you don't see a Reset My Default keychain button, close the preferences window
      
   2. Select the “login” keychain from the left side of the Keychain Access window.
      
   3. Press the Delete key,
      
   4. Then click Delete References.
6. Quit Keychain Access.
7. Restart your computer.

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Centos:

1. Open a terminal and type in: seahorse
2. This will open a GUI window with passwords and keys
3. You can then right click each password you set and delete the password if it was forgotten.
4. After deleting the desired passwords, restart the computer

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