As you have subscribed through the Apple App Store, you can cancel and process a refund only through Apple directly.
Here's how to do it:
Open "Settings" on your Apple device.
Tap on your photo.
Tap on "Subscriptions" > Select Curio.
Click on "Cancel Subscription".
Once that is done, here is how to request a refund:
Click on "Billing & Subscriptions".
Click on "Subscriptions & Purchases".
Click on "Request a refund".
If you would like more information on this, please drop one of our team an email at listen@curio.io, and they will be on hand to help.