I am making a site using Piano Black 1.5 theme and I would like to have a custom menu on top of the page. I just instlled WordPress 3.0 and found out you can make a custom menu with pages AND categories. So, I would like to replace the current menu of Piano Black 1.5 theme (that allows only pages or categories) with this new menu.
I can make a custom menu and add it to the sidebar as a widget but I would like to use the code of that new menu to replace the default one. Where could I copy that code from and where do I need to paste it?