A1: Open App Store→log into your App Store account→click your account→click Subscriptions →find this app→click it→click Cancel Subscription
A2: This APP need to pick up sound by iPhone Microphone, please kindly follow the steps: Settings–Privacy–Microphone–Click this app
A3: iPhone Settings-General-Language & Religion-change the language into English
A4: Please kindly click “Restore” button on the top right of the “Try Premium” page, and wait for a moment until it change to the home page automatically. Then it works.