php - Displaying Co-authors Plus Wordpress Plugin -

I originally posted it on the Wordpress stack, but apparently it was off-subject (???) And it was suggested that I ask if it is here, so here's the basic question:

"I am trying to add the theme co-authors plus plugin to an old newspaper.

However, I have followed the document and it is not just showing to many authors.

According to the instructions, I have single.php The code that has been added to:

  if (function_exists ('coauthors_posts_links')) {Coauthors_posts_links ();} other {the_author_posts_link ();}  

However, the post is still showing only one author. Single.php is the only place where the_author () is used, this should be the right place to add code.

Any suggestion It will be highly appreciated. "

After that, I saw that the plugin files are clearly inactive, according to Wordpress Edit I'm not sure I believe because all backend works, it's just a front end that is not working.

If you look further in the instructions ...

  If (function_exists ('coauthors_posts_links')): printf (__ (' & lt; span class = "% 1 $ s" & gt; at & lt; / span & gt;% 2 $ s & lt; span class = " Meta-sep "& gt; & lt; / span & gt;% 3 $ s, 'twentyten'), 'Meta-pep meta-pp-writer', Sprintf ('& lt; a href ="% 1 $ s "Title ="% 2 $ s "rel =" bookmark "> % 3 $ s  & lt; / a & gt; ; ', Get_permalink (), esc_attr (get_the_time ()), get_the_date ()), coauthors_posts_links (null, empty, blank, empty, wrong));