This plugin is used to change the Author slug without modifying the database. If you are an admin or a user with the “edit_users” capability then you will see an extra field on your user edit/profile edit page.
Also, this gives greater security as your user name isn’t revealed through your URL structure. It also allows you to make your URLs look a bit cleaner.
For Example: http://example.com/author/username/ could become http://example.com/author/user-name/)
Requires WordPress Version: 2.8 or higher