What I did:
I use EasyBlog for Blogging and EasySocial for streaming.
I wrote some blogposts from the backend as the administrator "Frederic".
Later, I changed the blog-author from "Frederic" to my blogging account "espi".
Then I watched the public easySocial stream (I had to switch off the option to automatically hide admin posts)

The error:
In the EasySocial stream, there is still the message, that the admin "Frederic" created the posts
but I changed all posts to the same author "espi",
see: https://vorbereitung.online/de/socialnetworktest

The question
Can I change the creator of a blog to an other user?

Thank You very much,

Frederic Espitalier