The password change software isn't all that easy to use Lona. I think you may have gone wrong somewhere. The software offers to change the
Administrator user by default, so I am assuming this is the password you have changed.
If so, and assuming you've saved the changes you made to the password database, you should be able to log in as Administrator with the password you set.
Of course, if none of this makes sense to you, the disk probably isn't working properly
Did you get screensful of text as Linux boots?