How do I cancel my YouTube subscription?

Greetings,

Welcome to the Apple Community, where some of us do our best to help each other.

Wondering if you have noticed the "Related Article" link from Apple Support, above your question in this discussion.

That article may help you with the unlisted subscription.

Or try this article, which may have the answer:

Get help with subscriptions not billed through Apple:

https://support.apple.com/en-au/HT207865

Hope this does help you cancel :)

PS:

If it is a free subscription:

You might want to try cancelling from You Tube's "Manage" Subscriptions

https://www.youtube.com/feed/channels

(ie Click the little bell beside each subscription and choose "None")

Cheers :)