Why can’t i “change the country” on settings? ? (in this app)

I don't think it has an option to change your country. If you'd like to see things in a different language, that's probably a different story.

Delivery time, however, on most occasions there will be a dispatch and shipping time, which together make up the delivery time. Dispatch time is the time it takes for an item to be sent after an order has been placed. The shipping time is the time it takes from the moment the item is sent until it arrives at its intended destination.