To access the Password preference tool, click Launch, then choose Preferences -> Password.
The Password
preference tool enables you
to change your login password. To change your login password, perform the
following steps:
Start the Password preference tool. A Query dialog is displayed.
Enter the old password.
You are not prompted for the old password if you are logged on as root user.
Enter the new password, then enter the new password again to confirm.
Your new password takes effect the next time you log in.