Just open your Adobe account and choose to manage your account. You will find a place there to cancel your subscription. Remember that if you have had the creative cloud for less than a year you will be charged a penalty for early cancellation.
Hello and thank you for your reply.
"You will find a place there to cancel your subscription"
I've found the place but when i click on, it told me that i need to come here... I tried to call them and nothing helps.
I have a monthly subscription, prepaid.