Who can add, edit, and assign co-authors? Is there a special capability one needs to have for doing this? On my site, the administrator can obviously do everything, but a user with the WordPress "editor" role cannot add, edit, or assign co-authors.
I would like to give these capabilities to the editor role. Using the Members plugin, I don't see any Co-Authors Plus related capabilities that I can assign to the editor role. How can I do this?