HT2736: iTunes: Sending iTunes GiftsLearn about iTunes: Sending iTunes Gifts
Currently Being ModeratedDec 4, 2012 12:57 PM (in response to chisolm30)
According to that page, underneath how it says to set up an allowance it says :
Once you've purchased an iTunes Allowance, your credit card will be charged for the full allowance amount on the first of every month. You can cancel an allowance at any time from your iTunes Store Account Information page by clicking on Manage Allowances, locating the allowance you wish to cancel, then clicking Remove.
So I think that you should be able to do it on your computer's iTunes by logging into your account via the Store > View My Account menu option (Store > View My Apple ID on iTunes 11), and you should get a 'Manage Allowances' section (as I don't have any on my account I can't check)