If you made code changes, then you need to start showing us what you have. Surely you can just try things again? How are we supposed to help you become unstuck if we can't see what you're trying?
This might be too much for you right now if you're already struggling with this, but you could consider using version control (e.g. Git or Mercurial) to keep track of your changes.
This might be too much for you right now if you're already struggling with this, but you could consider using version control (e.g. Git or Mercurial) to keep track of your changes.