This snippet shows how you can display multiple authors via the Co-Authors plugin within the theme's meta section (this is the section that displays the post author, category, date..etc below the post title by default).
For some reason CloudFlare won't let me paste this particular snippet on my site so here is a link to the snippet: https://gist.github.com/wpexplorer/51a816003b3ef0c2272be2d8740f6307
// See link above