I just want this image to POPUP and the button to link

I just want this image to POPUP and the button to link to ORDER.

http://www.healthyseasonalrecipes.com/wp-admin/post.php?post=7650&action=edit

Very simple. Very easy but not working. If I add the image to the popimage then it shows a very tiny image even though I set the width and height.

Granted support access.