Hello and welcome to justanswer, My name is ***** ***** i will be assisting you today,
1. Go to My Account : https://my.screenname.aol.com/ and sign in with your master Username and password.
2. Type the answer to your Account Security Question and click Continue.
3. Under Service Options, select Manage My Subscriptions : https://s.aolcdn.com/os/help/manageact2.gif
4. On the Manage My Services & Subscriptions screen, click Change Payment Method : https://s.aolcdn.com/os/help/ACTUPDATE.gif
5.Here, you can edit your credit card infos.
6.After your payment method is changed for your subscription, go to Manage My Account Details and select Manage My Wallet and Billing Info. : https://s.aolcdn.com/os/help/UPDATEACT.gif
7.Remove the payment method you no longer want on the the account by clicking on the trash icon.
8.You will receive confirmation the payment method has been removed from the account.
let me know if you need any further help