If you have subscribed to your Fddb Premium membership as an in-app purchase, the subscription will be processed via your iTunes account.
Unfortunately, we cannot cancel your subscription for you, as Apple does not give us access to your subscription or payment details.
Please also note that uninstalling the Fddb app or deleting your user account will not automatically cancel your subscription.
You must always cancel your subscription manually in iTunes. This is done as follows:
1. Open iTunes on your iPhone or iPad.
2. Log in to your iTunes account.
3. Select the Fddb subscription you want to cancel.
4. Deactivate the automatic renewal.
5. The subscription will now expire at the next possible date.
You will usually receive a confirmation by e-mail. Please check your mailbox and spam folder if necessary.
You can find instructions here:
https://support.apple.com/de-de/HT202039