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.
NoobzVPN accounts are metered by quota rather than by calendar days: you get a bandwidth allowance and a device count, and the account keeps working until one of the two runs out.
