However, every time when I pressed the button "Manage Plan"
there's NO "cancel plan" button!!!!
Could any staff PLEASE fix this problem?
Or help me to cancel this plan?
This is an open forum, not Adobe support... You need Adobe support to cancel a subscription
-start here https://forums.adobe.com/thread/1703848
-or by telephone http://helpx.adobe.com/x-productkb/global/phone-support-orders.html
--and two links which may provide more details, if the above links don't help you