You can only unsubscribe via iTunes if you use your Apple account to pay for your subscription. If you purchased your subscription through the website (which you did if you got a free 30 day trial), you must unsubscribe via the website – even if you still use the app on your Apple device!
We recommend following the steps listed in the web link below for the most up-to-date information about unsubscribing from iTunes. Please know that we do not have access to your iTunes account and cannot complete this for you.
Subscriptions to The 4 Blades Magazine are renewed automatically; if you wish to cancel your subscription, you must do so before the next billing cycle to avoid being charged.