To set a free shipping method for a certain product:
  1. In the administration panel, go to Products > Products.
  2. Click on the link corresponding to the necessary product.
  3. Follow to the Shipping properties tab on the opened page.
  4. Select the check box of the Free shipping option.
  5. Click the Save button.
    NOTE: You are able to enable Free shipping for a product using the import option. The description of the correct format can be found in the Imported fields format article.