Thank you for your question.
Could you please clarify is it our theme issue? Try to temporary switch to default wordpress theme and see if this option will be available then.
Also, check your shipping configuration in WooCommerce -> Settings -> Shipping. You can find all the necessary information in WooCommerce documentation https://docs.woocommerce.com/documentation/plugins/woocommerce/getting-started/shipping/core-shipping-options/
Thank you in advance!