In order to show Buy or Shop Now buttons in the Showcase you will need to do upload your product catalog:

  1. Go to the Manage Catalogs section
  2. Create or add a new product catalog.
  3. Before uploading your catalog file, make sure it properly contains Add to Cart URLs for each product.
  4. Map the Mfr Name, Mfr Part Number, Add to Cart URLs and all other columns needed.
  5. Upload the catalog.

It may take 15 minutes before the changes take affect.