I was looking for the same answer and came across your post. Further digging came up with these posts: https://steemit.com/steemit-guides/@pfunk/your-steem-account-is-worth-money-how-to-secure-it-with-a-new-owner-key-to-keep-it-yours-forever

https://steemit.com/steemit-guides/@pfunk/a-user-s-guide-to-the-different-steem-keys-or-passwords

Hope they help.