Wrong image posting. How to change?

Hello,

I have the premium version of this plugin and I am trying to change the image that it posts to my Social feeds. I run a classified ad site and nextscripts is posting the last image of the ad, not the first like it should.

Please let me know what I need to do to change this (thevapetrader[dot]com). I tried getting support on this about a year ago but never was provided a solution that worked.

Thank you,