Facebook image to large

 I am sure you have answered this someplace but can't find the answer on your website. Here is my link for my Facebook post.  The link preview shows up to large to fit in the space allotted by Facebook.  How do I fix this and how can I select a different image if I wanted to.

Thanks

Please be noted that the header image will be displaying on the Facebook page automatically when you share a link. However, you may select another image from the form by using the image scroll. I notice that the required image is hidden on the form and so it is not displaying. As a workaround, you may display the image on the form temporarily so that you can select the image on the facebook. Once you are done posting it on the facebook, you may hide the image on the form again.

still dealing with this problem. this is my form link

 https://form.jotform.com/Thosbryan/adoptionapplicatIon1214a

someone else told me that the logo image was the one being used

by facebook when posting. the above form has both a logo and header image

but i still get the partial image with the debugger tool and on the facebook post.

also, what do you mean by:  "However, you may select another image from the form by using the image scroll."  

You can modify the dimensions of the image logo so it fits on your facebook post. Click on the "lock" button to unlock the symmetry of the dimensions.

OR

You can also re-upload a different image (smaller dimensions) so it will fit in the logo as intended.

---

also, what do you mean by:  "However, you may select another image from the form by using the image scroll."  

When adding your own image, you have option to upload or select from existing my image list.

Example: