can some explain that css attributes addon/

what is the CSS attributes addon and the my changes addon do and how do i use them

was told to use the CSS attributes addon to help me change around the code for my site layout? but no idea what that is

Have no idea about a CSS attributes addon. Check with the author.

The my_changes addon is a “stub” that is there for you to extend your cart. There are a ton of articles here in the forum on using hooks and the knowledge base too. Suggest you do some research. You can get an idea about using hooks in this paper. Just substitute ‘my_changes’ where it references ‘local’ since it was written before the my_changes addon was around.