We regret to hear that you want to cancel your XING subscription.
Here is how to proceed with the cancellation of your XING subscription:
1. Go to "settings" in your iPhone.
2. Tap on your name at the top ("Apple ID, iCloud, Media & Purchases").
3. Tap on "Subscriptions".
4. Select the XING subscription and deactivate the automatic renewal.
If you have issues with the cancellation process, please contact the iTunes support directly.