Drop-down menu option not appearing

I noticed in this thread:

https://wordpress.org/support/topic/option-to-change-radio-buttons-to-dropdown-menu

That there should be a shipping display options section where I can change the Printful shipping radio buttons to a drop-down menu, but there isn’t one in my woo commerce settings. I have the latest woo commerce, latest Printful plugin, and WP 4.4

http://www.thedaddynamic.com/shop

https://wordpress.org/plugins/printful-shipping-for-woocommerce/