There is no easy way to do that. When you select the image item in the Muffin Builder you do have an option to insert a secondary image, or paste a link to a youtube video but there is no option to insert a contact form. You can try this custom method using a little custom HTML
Comments
I want instead of the popup-Button the Image as clickable, than starts the popup.
Is this possible?
Regards.
<div id="you-custom-id" style="display:none">SHORTCODE HERE</div>
Cheers!