Hi 純菁林,
As per the issue description mentioned above, you would like to cancel the susbcription, is that correct?
On checking the details for your account using the email address you are logged into the forums, as well as the order no. but no details were found. Do you have any other email address or order no. associated with the purchase?
You may also refer to the steps steps given in the following help document to: Cancel your membership or subscription | Adobe Acrobat, Document Cloud PDF services
You may also check the products and plans under your account using this link: Account and membership help
Thanks,
Shivam