Enable blog author change option in WordPress
To enable author selection option in WordPress, follow these steps:- Log in to WordPress as the administrator.
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On the Dashboard in the left sidebar, click Post, and then click on Edit option for the selected post:
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Click on the Screen Option drop to and then enable the author checkbox:

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The author name drop down menu appears at the bottom of the blog post. To change the blog author name, select the author name from the drop down menu: