Due to our agreement with Apple in order to get our app in the iTunes app store, Apple will handle all refunds and subscription changes, or cancellations if you paid via Apple. Chess.com support is not able to give refunds or make changes to subscriptions purchased through Apple, you must contact Apple support.
Here is an information page for how to manage your Apple iTunes membership subscription with Chess.com:
https://support.apple.com/en-us/HT202039