Just a reminder, you need to do this before the cut-off time, 3:00 PM Pacific Standard Time (PST). If you've already passed it, you need to contact our Merchant Services Team. They have tools that can pull up your account in a secure environment and process the cancellation for you.
That should point you in the right direction. Please let me know how it goes in the comment section below. I'm only a few clicks away if you have any follow-up questions. Have a good one.