If you subscribed through the Apple App Store, Apple manages your billing. RP can't change, cancel or refund it for you.
- On your iPhone or iPad, open Settings.
- Tap your name, then Subscriptions.
- Tap your RP subscription.
From there you can see your next billing date, change plans, or tap Cancel Subscription. If you cancel, you'll keep access until the end of the period you've paid for.
For more help, see Apple's guide: Cancel a subscription from Apple.
Refunds for App Store purchases are handled by Apple, not RP. To ask for one, see Request a refund from Apple.