You can force a custom author name and link for each and every blog post in your WordPress site and this you can easily do while creating or editing any blog post in your WordPress site. Custom Post Author is the new WordPress plugin that allows you to change the author’s name and URL within the post. Great for the blogs that have many guest posts.
Installation & Usage: Install and activate Custom Post Author plugin. After activation the plugin adds a metabox on every Add New/Edit post pages. Now all you have to do is type custom author name and a URL while creating or editing a blog post.