If you subscribed in our Online Store:
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​Enter your profile from the left menu:

Then tap "Details" to the right of your "Sign up date":

Tap "cancel subscription":

This is what you will see when you have successfully unsubscribed: 

If you subscribed in-app:
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Your subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your iTunes will automatically be charged at the same price for renewal, as stated above, within 24-hours prior to the end of the current billing period. 

You can manage your subscription and/or turn off auto-renewal by visiting your profile in the App Store of your device after purchase.
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We do not offer refunds for 1L charges.