Change the automatic description

Hey!
The support doesn’t seem to get much answer but I am trying to reach out for help here anyway…
I’d like to change the automatic description when you pin an image. It’s the post title by default but I’d like it to be the img title.
I don’t seem to be able to change that. Does anyone have a solution?

Thank you in advance!!

A.

http://wordpress.org/extend/plugins/pinterest-pin-it-button-for-images/