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Glad to help.
The first thing that usually helps people are the plugin settings, “Assigned Author” and “Disable Replace Author”. When properly configured those settings enable supportive themes to display the post author name on submitted posts.
So what are “supportive themes” you might ask? I have summarized the requirements here. Also this post explains some related information about the “Registered Username” setting. Those articles contain all the details, requirements, etc.
I hope this helps, let me know if any further questions.