Missing data for Rich Snippets

Dear Nova Lite,

I Installed the “All In One Schema.org Rich Snippets” plugin for my blog. Unfortunately when I run the pages through Google Structured Data tester if find that the following values are missing:

Missing required field “entry-title”.
Missing required field “updated”.
Missing required hCard “author”.

I found some tutorials how to fix it in the single.php file (described here https://www.digitalhubinc.com/2014/01/Fix-Google-Authorship-Markup-Warnings.html).

For example they write to change

<h1 class=”entry-title”>Page Title</h1>

for

<h1 class=”entry-title”><?php the_title(); ?></h1>

How ever in your single.php I can’t find these values.

What can I do?

Thanks a lot!