I need to cancel my subscription?

Start here, Subscriptions and Billing - Official Apple Support

Tap on Settings. Tap on your name at the top, then Subscriptions. Find the subscription and tap on it, then tap Cancel Subscription. If there is no Cancel Subscription button and instead shows renewals under Options it has already been canceled. The current subscription will still continue to its end date after canceling.

If it doesn’t appear at all then either you subscribed using a different Apple ID or you subscribed directly with the app provider, and not with Apple.

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