How to change your F-series Samsung Smart TV country to download foreign apps
Choose TV as a source with your remote.
Select Menu on your remote
Select Setup. Continue the setup as you’d usually do and stop at the Terms and Conditions page.
On the Terms and Conditions page, enter the following sequence on your remote: Mute -> Return -> Volume Up -> Channel Up -> Return
A list of all countries will appear. Choose US or UK according to the apps you want available.
Accept the Terms and Conditions and continue setup as usual. When the setup is done you'll be able to download any app available in the country you chose.