I want to change the thumbnail when I shared a link on instagram or in facebook. I found this page :
But I don't have Social sharing image like this page mentioned (can be seen at the attached picture) .
I also noticed this page : https://developers.facebook.com/tools/debug/og/object/
but could not change it successfully. Could anyone help about changing this thumbnail over shopify theme?
ps: when I share my store link on instagram, I see one of my products image. For example I want to share my store link with my logo.