This is really easy to do. The only thing that can cause a problem is that the screen options might not be displaying the Author field on the edit post / edit page screen. But, again, it’s easy enough to get this to appear.
If you scroll down on the Edit Post screen, you will see an Author field with a dropdown box that contains a list of all the authors on your site. It looks like the following.
Select the new author for the post and update the page. The post will now be attributed to the new author.
If you don’t see the Author field on your edit screen, go to the Screen Options tab at the top right of the page. Click on it and then check the box for Author. When you check the box, nothing really happens but the field will now be on your screen. You can click on the Screen Options tab again to close it.
So, there you go – super easy. It’s just a case of locating the right settings and where they are located.
photo credit: atbartlett