After successful subscription request, you have a two week trial then after which $16.49 will be charged automatically against the app users linked app store account/payment method. 

A user can cancel at any time (even after trial period) – which will cancel the auto renewal, but this still allows the user of the app until the end of the annual period. MiClub can't process cancellations or refund requests either, the user must do this via their app store accounts or via the App store help centres.

To Cancel a subscription from the app, access the Menu and select Manage Subscriptions 

This will take you to the App stores list of subscribed apps you may have. Select MiScore from the list and select cancel. 

You can re-subscribe at any time as well.