In short, your internet connection IP address already identifies you to a specific country. In order to look like you are coming from another country, you need to contact another computer in the country you want to be seen as, and FROM THIS computer, launch the actual connection to the targeted service. The service has to see that the source IP address is from the right country.
Usually, this means that you either use a service such as TOR that will redirect your connections from all over the world, or have a computer in the right country, that you can completely control, or at least that you control enough to launch another connection from it. TOR might be your best bet.