Reply from Tom | December 3, 2013
I'm not sure that I understand. Please elaborate on what exactly you are trying to do.
If you are referring to the images which Pinterest shows when you share your site on their service, please contact Pinterest directly for further assistance with this issue. From the screenshot that you provided it seems that Pinterest only allows a choice between your Social Thumbnail and the image on your home page. Generally speaking (this may differ depending on the social network in question), your Social Thumbnail is the image which will appear when your site is shared on social networks (e.g.: Facebook). You can find more information about the social thumbnail here.
Please let us know if you require any further assistance.
Reply from sylviaveldhuis | December 3, 2013
Thank you for your answer. I hoped you could solve this problem, but I understand Pinterest is the problem.