Just choose which country you want and click the button. Pick whichever location is closest to you, or actually closest to where the content or service you are reaching sits -- for most people that is the same thing, but it is not always, and the account works the same regardless of which one you choose.
Vless over a raw TCP connection with XTLS -- the most direct of the four paths, with the least framing between your device and the server. Fewest layers and the lowest overhead, but also the least disguised.
