No problem! SellHound settings automatically post your listing as US only but you can revise your eBay preferences in the app on the Account Screen so that your listing is set up to sell internationally with the eBay Global Shipping Program, or GSP.
The cool thing about eBay’s GSP is that they take care of charging your international seller the price of shipping to their country. This means that you don’t have to change anything else, including the price of the shipping! If the item sells internationally, you will be notified by eBay when to ship. eBay will provide an address within the USA, so the shipping costs are the same. eBay’s shipping partners will then ship it to your buyer at the international destination.