How do I unsubscribe someone from Subscribe to Comments plugin?

have a reader that want’s me to unsubscribe from on of my popular posts that they’ve subcribed from the Subscribe to Comments plugin, but I don’t know how to do it.

This post claims

“Hi have you checked under WordPress Admin >> Tools >> Subscriptions. There should be an entry there for the person you would like to remove from the subscription. Click on their e-mail address and it will take you to their manage account. You now can select to remove the subscriber from the subscription.”

https://wordpress.org/support/topic/user-wants-to-unsubscribe-to-comments-how?replies=2

but there is no tool labelled subscriptions in my wp admin panel under tools.

And I go into setting, then Subscribe to Comments but there is nothing there how to remove a subscriber from a post.

How do I remove him from subscribing to the comments for that post?

https://wordpress.org/plugins/subscribe-to-comments/