That code would need to go in the content.php file, but the actual location would be based on where you want it to display. You may also need to remove the open & close PHP tags around that code if where you want to place it is inside already existing PHP.
thanks for the reply. i'm wanting the description for category to show at top of the category page, before the actual post. so do i put it inside other php or list as is? if i put inside code, where or what code do i put in, and what are the actual open/close php tags?