Please have some patience as it may take some time for the system to update the status. You will be able to see the cancel option soon. Please be sure that there are no problems with your payement option as this will disable the cancel button.
And do not panick: I suppose you subscribed the 10 images/month and the first month will be free. You’ll have until the end of that month to cancel without being charged. After that you still have 14 days to cancel and the charge will be refunded.
Let us know if the problem persists, lat say in a 2 days time frame.
Regards, Abambo Hard- and Software Engineer and Photographer.