If you don't mind the framing that Instagram provides, you can use the three dot icon next to the smiley face pulldown menu,
choose "media", then insert the link to get:
[MEDIA=instagram]B-pE_V3n70g[/MEDIA]
But if you're really persistant on some older versions of safari you might be able to get under the hood with control clicking on the picture, choose inspect element, click on the resources tab, expand the images folder on the right and side and go through the list of all the images on that page, until you find the one, and then copy the link, past that into URL box when you embed an image normally here in the forum. Here's the result of the long winded effort, and I do believe the image is on topic: