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I think you need to login with your owner key to see the option

I don't think you can as it is the key used to change the other ones

you no longer can but you can use the reset password to get a really good password just make sure that you dont loose that really long password

So if you cannot change your key then this means you can't cold-storage your keys, like this article describes:
https://steemit.com/steem/@xeroc/paperwallet-easily-secure-your-account-with-steem-paperwallet-generator

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