He said he did it online but many people, from memory, don't actually have online accounts. If you just signed up by putting in your sky card etc, you won't have an account.
I added it through Sky box mate. And set up the online account. Been really easy through their site to turn it on and off in the ‘Manage Account’ or whatever.
It has a button for Cancel Subscription.
Sadly I same as many where I have signed up numerous times due to our ganes getting put on there for domestic cups/early qualifiers.