If you paid with a Credit/Debit card:

Open www.filmon.com in browser, login and then go to http://www.filmon.com/my/orders page. Once you are there, find your most recent order number, click on it and click on Cancel button that will pop up. If the button becomes grey and un-clickable, it means you have successfully canceled your subscription. Note, you will be able to use it until the next billing date but will not be charged again. No pro-rated refunds apply.

If you paid with PayPal:

OPTION 1:

Log in to your PayPal account.
Click Profile near the top of the page.
Select My money.
In the 'My pre-approved payments' section, click Update.
Select the merchant whose agreement you want to cancel and click Cancel.
Click Cancel Profile to confirm your request.

OPTION 2:

Log into your paypal account
Click the cog wheel at the top right
Click Payments, then click preapproved payments.
Select the seller whose agreement you want to cancel and click Cancel.
Click Cancel Profile to confirm your request.

If you paid with iTunes:

1. From your device's Home screen, tap App Store.
2. Tap Featured at the bottom of the screen.
3. Scroll to the bottom of the page.
4. Tap the Apple ID button in the lower-left corner. (If you are not signed in, tap the Sign In button, and sign in with your Apple ID. Then, scroll back to the bottom of the page, and tap the Apple ID button.)
5. Tap the View Apple ID button.
6. Enter your password and tap OK.
7. From the main account page, scroll down and tap Manage App Subscriptions. If you don't have app subscriptions this button will not be displayed.
8. You'll then be taken to your App Subscriptions page.
9. From your Manage App Subscription page, choose an app subscription.  
10. Tap the subscription category for which you want to disable auto-renewal. 
11. Tap On to toggle the switch to Off.