How to stop or cancel a charge in my account

To Whom it may concern,

ITunes is debating my account for a subscription for showtime . Apparently there was a misunderstanding with Hulu Plus. And the amount for $ 10.99 . I am going to keep my account with Hulu . I really appreciate the help on how to stop this debit from ITunes month. And thank you so much for your help and service .

ALways ,

M. Zirkle , SC