Can’t Cancel Subscription. – Scan to PDF: Converter Scanner Review

I’ve had the app for about a month and it is not as intuitive as I expected it to. They already charged me $9.99 for 1 month. I decided to cancel the subscription and neither Apple nor the developer make it easy. There’s no “Cancel Subscription “ button on the app settings and I cannot unsubscribe from the App Store either. With every update Apple software engineers change a ton of stuff around and don’t let you know. That’s something they can improve on. I don’t know what to do. Do I just get rid of the app and hope they don’t charge me again?
Review by Warm Blanket. on Scan to PDF: Converter Scanner.