If I understand correctly, you have a subscription for Magix Video Pro X and you want someone on a user forum to cancel your subscription. No one here can do that.
Did you bother to read the terms and conditions for a subscription, including how to cancel? No? If you had, then you would know how to cancel your subscription.
Then I suggest that you do so now. Surely you are able to do a little bit of searching yourself.
email infoservice@magix.net and tell them you wish to cancel your subscription. Cancellation will take effect exactly one month from the date on which Magix receive your email.
If another payment becomes due between the date that you send your notice of cancellation and the date, one month later, when the cancellation actually occurs, you will be charged that additional payment.
See terms and conditions of Subscription cancellation here.
Scroll down to Special provisions for software subscriptions section 2.
Since @mansour-mohsen seems to have deleted his first post to this thread, thus rendering all replies rather meaningless because of the lack of context, I will close this thread.
@mansour-mohsen, for future reference please do not delete your question if you have started a thread; simply click on whichever reply has answered you (the option to Tag as Solution) or add a final post to explain that the problem is resolved or the question is no longer requiring of an answer.