You may change your subscription terms in your app store. To get there, go to Settings --> Huckleberry Premium --> Manage Membership.
Alternatively, here is how to do it by device type:
Android: Open the Google Play Store and tap the menu icon (3 lines). Tap “Membership” and tap on Huckleberry. You may manage the membership terms from there.
Please get in touch at email@example.com with any questions.