I want to change a subscription

You don't say how you want to change the subscription. See if these links help. If they do not help, you can contact Apple directly by clicking on Get Support at upper right corner of any forum page...

Subscriptions and Billing - Official Apple Support

If you want to cancel a subscription from Apple - Apple Support

jedoughty Said:

"I want to change a subscription and it won’t let me?"

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Changing a Subscription:

Use a Computer for this:

Try performing this using a computer, as it would be more user-friendly doing so.

Go Here:

• Subscriptions and Billing - Official Apple Support

• How to Switch to a Different Subscription Plan - Apple Support

• Manage Subscriptions in the App Store on Mac - Apple Support

• If you Want to Cancel a Subscription from Apple - Apple Support

• Manage App Store Purchases, Subscriptions, Settings, and Restrictions on iPhone - Apple Support