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You needed to be a Steemit user over 8 months ago. Apart from that, you use the same login credentials as Steemit, and the UI mirrors Steemit. So just login and go to your wallet and Power Down

Ok, thanks. I am assuming it would be whatever my password was back then? Seems like I would want to make sure it no longer was my active one for the Steem blockchain (for security reasons).