In CS6 I create a simple rectangle and increase the roundness of the rectangle. I then select the shape and choose edit > copy HTML code and I open Dreamweaver CS6 and paste the code into the code window. I thought it was supposed to write code to replicate the shape I created in FW, though instead it is just referencing a graphic of the shape I made in FW that was exported. What did I do wrong?
Here's a good tutorial to get you started on exporting HTML and CSS from Fireworks.
Use the CSS Properties panel, not Edit > Copy HTML Code.