Author, title, updated errors in Google Webmaster - how to fix?

Hi, Google is now considering the lack of author, title, and updated as errors with possible penalties for rankings. I found this guide on how to fix but cannot find where the hentry element is located - could you pls point me in the right location - if this is the solution of course. Many thanks

Hi,

What are the errors you got? Can you please post them here?

Best Regards,
Csaba