To find them, you'll need to consult a repair manual specific to your LeBaron's engine. These manuals typically have diagrams showing the location of all freeze plugs. You can find these manuals online (often as PDFs) or at auto parts stores.
Generally, freeze plugs are found on the engine block itself, usually in somewhat recessed areas, often on the underside or sides. They are typically circular and relatively easy to identify once you're looking for them, as they are usually slightly recessed. However, *never* attempt to remove or replace them without proper tools and knowledge. Improper removal can severely damage the engine block.