In order to upgrade your app to premium level, you should first subscribe to one of the available packages. To get started with purchase process, please launch the app and then tap on the "menu" button on top-left side of the app. In the opened window, tap on "Go premium" and complete the purchase process by tapping on "buy" button beside each package.
After your successful purchase, launch the app again and sign in with your email address. This email address will be your premium username. Whenever you want to use your Betternet premium account on any of your devices, you should sign in with that email.
**Note** : Premium service is currently available for only Android platform. The iOS and windows apps will be in Store soon.