I think I just figured it out for myself. I was going to ask this as well but saw your post but no replies. I tried looking at paypal as well and that is where you do it. I used my laptop and not the app. If you look at your recent activity you will see a recurring payment for -$8.49 from Juan Cianciulli, who I assume is the server owner or someone who manages the money. After clicking on the transaction you can see that it says active. Right next to that it has a cancel button and there you go. Hope this helps. If the names and prices are different then something sketch is going on.