One of the great options in WordPress is that you can post as yourself, or you can attribute your post to another person who has an Author account on your site. But where did the drop down menu of authors go last time you upgraded?
When you log into the Post >> Add New post editor, there is a tab on the right side that says “Screen Options”. Click there and you will see all the options for the different boxes you can have on your post editor page. Check the boxes for the options you want to see in your editor and then click the “Screen Options” tab again to hide it.