You can easily cancel the subscription from your device. Please note that deleting the app will not cancel your subscription. To cancel the subscription please go through the steps below, according to your device's platform:

Google (Android):

1. On your Android phone or tablet, open the Google Play Store. 
2. Tap Menu on the left, then check if you’re signed in to the correct Google Account.
3. Tap on Subscriptions.
4. Look for a Castle Crush subscription and click on it. 
5. Tap on Cancel Subscription and follow the instructions on the screen.

Apple (iOS):

1.Open your device's settings;
2. Go to iTunes & App Store;
3. Click on your Apple ID and select View Apple ID;
4. Got to Subscriptions;
5. Click on Castle Crush and select Cancel Subscription.

Please keep in mind that the Free Trial automatically becomes a Weekly subscription if not canceled 24 hours before the trial expiration date.