Need to cancel my subscription

Click here and follow the instructions; if you're referring to iCloud+, use this link instead.

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Right. There are two considerations. You can add a new card as your method payment then delete the existing one.

The issue of your "active subscription" might require the assistance of Apple Support to resolve. Do you can find out what the active subscription is? Contact Apple to see if they can assist if you continue to have failure in canceling it yourself.

Have you tried the steps Apple describes in If you want to cancel a subscription from Apple?

I am not clear on what it is that is it you are trying to achieve. Adding a payment method is not dependent on the status of your subscriptions.

To add or edit the payment method for your Apple ID see Add a payment method to your Apple ID - Apple Support

Alternatively, if you are having problems cancelling your subscriptions use the link Contact Apple Support in the support document I linked above.

The link at the top of this page also provides advice on declined payment methods.

Use the link in either article referenced above.

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Add the new one first.

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