Hi yaakov zeitoun,
Thanks for posting your question here.
In order to list your items with free shipping only, you should just need to select either "Flat Rate Shipping" or "Calculated Shipping", and then select the appropriate free shipping option for the locations that you are willing to ship to.
If you are using Flat Rate Shipping, you can offer free shipping by selecting the desired shipping option from the domestic and international shipping services menus and entering “0.00” in the “Cost” field.
On the other hand, if you are using Calculated Shipping, you can offer free shipping by selecting the desired shipping option from the domestic and international shipping services menus and then checking the adjacent “This shipping service is free” box.
I hope this helps. If you need any further assistance with this, please contact our Customer Support team directly from under the “Help” tab within your account and we will be happy to continue working with you.
-Mike