The Dynauthor plugin replaces the standard dropdown list selection method for authors with a search box, as the user begins the type a list appears of the authors matching that criteria. the list will update with each new character typed. This is designed for sites with a large selection of authors.
= How do I select the author when I can see it in the list?
Simply click the author, it will become bold and will fill in the field with that value, then make sure you publish/update your post.
Do I have to start with the first letters of the authors name?
No, the plugin will search any part of the authors name, for instance, to find ‘steven’, you could start to type ‘even’ and it will appear in the list of potential matches