How do I change the image that appears on facebook when I load the template?

Right now when I upload my template a picture of my son in his car appears.  i would like to change that picture to our new logo..  How do I do that?

To which form is this issue related to? Please provide us a link of your form.

Please use the 'Scrap Again' option of the following Facebook tool to debug your form. 

https://developers.facebook.com/tools/debug/