You can manage your Auderli subscription in a number of ways depending on how you originally paid.
Online / Web browser
Access the details of your subscription including billing history and payment methods from the Account Settings page of the web app through the 'Manage subscription' menu item.
Apple App Store
If you subscribed through the Apple App Store you can manage your subscription through Apple.
Google Play Store
If you subscribed through the Google Play Store you can manage your subscription through your Google Play account by visiting the Payments and Subscriptions page.