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Thanks @reggaemuffin, that´s what I´ve been looking for as the streemian page unfortunately isn´t as obvious about it showing "upgrade" functions instead.

You could have read the Opening Post, it carries a link to the page that allows you to revoke the posting permission.

That made it super simple. Thanks man.

Seconded!

Edit : go to http://app-account.streemian.com/ and put in your username and active key and it will remove the authority

Aah thank you, it's a bit unclear. At first it says upgrade account, but when you put in your name it says "downgrade".