All iOS subscriptions in The Mindfulness App are handled by Apple.
If you have an ongoing subscription and want to overview, cancel or change plan:
Open the settings app and click on the top bar "Apple ID name"
Click on iTunes & App Store
Click on the blue link "Apple ID-name" and enter your password if prompted
Click on subscriptions
-From there you can change interval and disable auto renewal
Thank you for using The Mindfulness App!