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The root user can change the password of any user by running passwd with the user name as argument:
will change jonnys password. Running passwd without arguments as root changes the root password.
If you need to add several new users and give them password you can use a handy program like Another Password Generator to generate a large set of "random" passwords.
From KDE you can change your password by going:
• K -> Settings -> Change Password
• K -> Settings -> Control Center -> System Administration -> User Account