free shipping graphic under product list on cat pg

Conceptually, you'd make sure you have retrieved that field from the database, test it for a value and use the results of the test to decide whether or not to display the image.

On the product detail page, viewprdcode.asp is where this logic will be introduced.  As to where specifically would take reviewing the code and locating the correct SUB.

If you are comfortable with coding, just make sure you have a backup copy and dig in.  If not, there are folks around who do such work.

Conceptually, yes.  It requires examining the code to make certain each aligns correctly, and there will be a different (yet similar) series of changes for the category page.

As you may know, PC allows you to switch from the admin panel the layout of the category and product detail pages.  So without seeing your site, knowing what image is going to be placed in your pages, and possibly other details, it is hard to be more specific.  But this is the general approach one would take to completing this request.