Author metatag not visible

Hello,

I have easyblog installed here: http://www.onlinemediakoffer.nl/leesvoer
but the meta author tag isn't visible/added to the html code.

+ I have enabled the 'show author' setting in the main Joomla configuration
+ I have added the google+ profile link to the settings of the bloggers

Can you help me with this? I could figure out were this is going wrong!

Thanks in forward!

Geert