1. In the app, click `Login` in the top-right corner (this will take you to the official site where you can log in).
2. Log in with your Google account or Login+pass.
3. Click the padlock icon (top right).
4. Click the text that says `Promo code available?`.
5. Press the `[Paste+Activate]` button. It will automatically paste your code and activate your Plus subscription!