This tutorial is going to show you how to change the author of a post in WordPress.
In order to change the author of an existing post in your blog, follow the steps listed below:
Go to your WordPress admin panel, navigate to Posts -> Edit:
Click the post which author you would like to change and find the Post Author section.
From the drop-down menu choose the new author and then click the Update Post button to save the change:
Feel free to check the detailed video tutorial below:WordPress. How to change the author of post,