Help me! How to cancel a subscription to "CapCut"?

It is canceled, you just have to wait for it to end.

This support article explains how to cancel a subscription from Apple on an Apple mobile device, Mac, PC, and online (see the Android section) ➔ If you want to cancel a subscription from Apple - Apple Support

Notes:

• You might need to scroll down to find the Cancel Subscription button.

• If you don’t see Cancel Subscription, then the subscription is already canceled and won't renew. An "Expires" date (instead of "Renews") means the current subscription has been canceled but will work until the expiration date. "Resubscribe" (or Renew) is just in case you change your mind about having it end.

• Deleting an app does not cancel a subscription.

You appear to be asking about a situation that is not being illustrated in your screenshot. It says nothing about payment. If you are seeing something about payment then we need to know what it says and when you are seeing it.