Problem with Review markup and Structured data

Hi there, 

Thank you for your plugin, it is very helpful!

I am getting into quite a chaos with the review markup and specially the aggregate rating. I have some pages with the testimonials and the views on it, but I want to have the possibility to get the enriched snippets with the aggregate rating in the SERPS. 

I am trying to do it with the settings of the plugin ? but I can not find the markup nor the aggregate rating in the page validating the schema nor in the SERPs.

Obviously I am doing something wrong but I do not know what, can you help me? 

Kind regards, 

The page I need help with: [log in to see the link]