Any subscriptions you've obtained through other services (Hulu, Prime Video, etc) will have to be unsubscribed through those services.
Any subscriptions obtained directly from the channel will have to be unsubscribed on the channel's website.
Note that most (all?) subscriptions pre-pay for a defined subscription period and auto-renew when the period expires. When you unsubscribe it stops the auto-renewal but the current subscription stays active until the pre-paid subscription period runs out. This is all explained in the conditions you agreed to when you subscribed -- you know, the stuff you agreed to without actually reading it.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X