On, the website, it said that : "you’ll be able to manage your plan shortly, and I haven't seen any buttons to manage it. I want to just cancel this free trial.
Sorry for the trouble it has caused to you.
I have checked your account details and noticed that you had signed up for Adobe Stock-10 image per month(one-year) plan on 28th February 2019.
You are unable to cancel your subscription since the order hasn't been processed yet, and that is the reason you are unable to get the "cancel" option. Do you want to continue with the trial subscription(first month) of Adobe Stock or want to cancel it instead?
Please confirm so that we can further assist you.
Yeah, I want to cancel it instead, because I cannot afford the annual fee.
Please check your private message.