Go to your account page, Go to Settings. Scroll down the page and you will find “Close my account” at the bottom left.
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Thanks for the heads up, hope it makes it easier for folks.
Just tried and received and ‘ERROR’ and was told to call Customer Service.
Luckily, I closed my account on Tuesday. This was my spouse’s secondary account that I forgot about. It’s not linked to any bank accounts or credit cards.