To learn more about Premium mode features, please follow this link: What do I get with Premium mode
To upgrade your status from basic to Premium, you need an Apple / Google Play ID with a valid credit card linked. Here's what you should do:
- Open the left-side menu and tap Subscribe.
- On the subscriptions screen tap the desired subscription period.
- The app will request you to connect to the App Store / Play Store — you'll need to enter your Apple ID / Google ID password.
- You'll need to confirm that you indeed want purchase the subscription by tapping "Confirm" in a pop-up window you'll see.
- After you've made the purchase, you'll see the date through which your subscription is valid, instead of the Buy button on the corresponding subscription screen.
Please note that when this period expires, the subscription will renew automatically and your card will be charged.