If you find your password insecure and wanna change it, you can do that with just type
Type your current password, then type your new password, and retype again to confirm.
In case you forgot your password, you can always reset your password with root user. First gain the root access
Then, redefine the password for user let say eddie.
With root user, you can check the details of the password management, regarding when the password is set, and the password duration etc for all user or particular user.
Check user eddie
passwd -S eddie
Check all users
passwd -S -a