オンラインストアに配送オプションを追加するにはどうすればよいですか？

You can add delivery options in the Content panel of the ST100 block, "Shopping cart with an order form".

Open the Content menu → Input Fields → Add input field → and select the Delivery variants field type.

List the delivery options, separating them with a line break. If the delivery option is not free, add the "=" sign and specify the price (numbers only, no currency).

The option to select a delivery variant will appear in the shopping cart. Delivery price will be added to the price of the product.

Read more: http://help.tilda.ws/online-store-payments/shipping