The Datafeedr store is entirely separate from your WP blog pages and categories.
If you want to add Amazon products to your store, you can do so by:
1. Go here: The Factory > Factory Menu > Custom Products
2. Add the merchant "Amazon"
3. Go here: The Factory > Your Store > Your Category > Add custom product.
4. In the pop up box, add your Amazon products.
After you are finished adding all of your Amazon products to your store's categories, update your store by clicking the [Update Products and Settings] button.