@Anonymous User cancelling is very simple, although if you are using the wrong username you'll just end up in a loop back to the homepage.
It's possible to have multiple Sky iDs and only the one attached to NOW TV will work. If you've had Sky Broadband or TV in the past your browser may have auto completed your old username. Try other usernames you might use or the forgotten username link on the login screen.
Also you could look through your emails for communications you've had with NOW TV and see if any of these include the correct one, or load the app which you've been watching on and check the settings to see which username is on that.
Once you've got the right one, clicking My Account will show the passes and you can cancel them with a few clicks.
