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I changed my password, authorization still there. I suspect they will keep 50% of my posting rewards, that is why I want to delete them.

Okay if it is still there, you can use cli_wallet to remove it. Have you ever tried cli_wallet? You can build your own or I can send you that file to run on Windows 10 or Linux. It's up to you.

You can refer to this post

No I never used but it seems complicated. What I understand minnowbooster can post on my behalf, but they don't get a share of profits on my posts. Is that true?

Yep, minnowbooster can post on your behalf, but they don't get rewards. That's true!

To run the cli_wallet, it is not so complicated as you think. You can read my post. I hope it will help.

By the way, I also delegated @streemian my posting key. I will remove it when I get back my home from my office today.

If you have any questions, you can find my username on Discord magicstone1412#1889

Thank you for your help, I appretiate it. I’ll try the wallet during the weekend.

I owe you what I promissed, so going to upvote your post too.

Thank you so much!

+++++

Edit: I found a more simple method here if you don't feel confident with cli_wallet

Thanks a lot. I appretiate it.

I loged it to steemconnect, but minnowbooster does not show up under authorized apps. I will try with cli wallet one day when i have more time. Thanks a lot for your effort.

My pleasure. I like to dig something new. :) I have replied the latest separate comment for easy to follow and deal with it. With cli_wallet, I de-authorized successfully posting key from @streemian