betsywallace As apparently seen through specific html code in template override file, Microdata is already seen with schema and article markup properties in Jb Responsive 2 which provides additional information for search engines to help them better understand your content which had been introduced with.
1) Also, As the same had been introduced with Joomla 3.3 and is limited to com_content and com_contact, You may also wished to check out this documentation which gives brief and comprehensive steps for reviewing and adding microdata in template override if not seen along with this tutorial to help along
2) Probably, You might require to toggle on the specific options in order to remove the errors for showing author, published date, show create date in article configuration in admin backend
3) You may try out this extension to get Schema Structured Markup for Better Joomla SEO which may derive the core purpose more suitably
To troubleshoot, I have reviewed the demo template and it doesnt come up with any markup errors
If still unable to resolve the errors, Can you provide your admin and ftp details in edit fields in order to take closer look
For reference, You can follow thread post (5 point) procedure.
