Once you enter an email and a password, you need to check your email for a pin or verification code and then enter that where it says to
Maybe that is where your defugalty is?
Then after you get that done, there is a "download" (or similar) button / link that comes up. Once the app is installed, you can set it to start when windows starts and you can choose countries and servers (many available for the intro deal of 7 days free) and you can log in and out from the app window.