I did it out of the apple store. I sent an email to support@pixerylabs.com, and they said they will cancel my subscription and try to cancel the undue charge, but I am very afraid that this will not happen. My credit card company said that they cannot intervene in the cancellation, that it has to be done directly with the company with which the service was contracted. I signed up for a subscription for a week, the charge was deducted normally, but after that I could not find a cancellation option, there was only the option to delete the account. I cannot afford to keep paying $25 a week and I do not know what to do.