multiple author in a post

I Use Co-Author Plus plugin and show co-author block in article page.We are using rehub theme.With this url this URL for help https://wpvip.com/documentation/incorporate-co-authors-plus-template-tags-into-your-theme/

What code needs to add?Need to add multiple author in a post; plugin will do that by default BUT it doesn’t show them on front-end,we need to do some changes in functions.php
Please help me to do that.
Thanks,