I have read some posts here to find it, but I failed.
In all these posts, the permissions page like this:
The current one is like:
As you can see, we can not change the keys one by one. From this post Get your private key from your steemit.com password, I learned that we can change the 4 keys by change the master password(which is generated when we create the account from facebook).
On the reset password page, we can change the account password. My question is:
'password' = owner key(private key) ?
Thanks all the developers hard work! You are heroes!