Google rich Snippet

I’m using Gamepress pro on WordPress 3.5.1 I am working on adding schemas / microdata to my site for SEO purposes, and have run into an issue. My website is https://www.techwhoop.com and when I use the google rich snippets structured data testing tool https://www.google.com/webmasters/tools/richsnippets?url=www.techwhoop.com&html=
to view my pages, I get the following errors:

Warning: At least one field must be set for HatomEntry
Warning: Missing required field “entry-title”.
Warning: Missing required field “updated”.
Warning: Missing required hCard “author”.

This is apparently a common problem with other WP themes as well, and there have been some “fixes” floating around but they involve modifying some PHP files, which I am hesitant to do with gamepress pro unless someone more knowledgeable can verify they actually work and fix the problem.

Here is one such fix I found: https://www.ilmigo.com/fix-hfeed-warning-field-set-hatomentry.html

But, it involves modifying single.php and actually when I go into editor under gamepress parent and open the single.php file, there is almost nothing in the file (not the lines of code the fix calls for).

Does anyone have a fix for this issue that is specifically compatible with gamepress pro?

Many thanks in advance.