Thumbnail link go to _b and not the _o

Hi,

I don’t understand, I realized that the link of the thumbnail go to the large picture on flickr but not the original, I want that the link of my picture go to http://farm6.staticflickr.com/….._o whereas I want http://farm6.staticflickr.com/5….._b.
Thanks in advance.

Regards,

Sam

https://wordpress.org/plugins/awesome-flickr-gallery-plugin/