I found this similar issue doing a forums search. Hope it helps:
"The new Seller app with the blue icon has very limited functions, and Etsy said they will be updating it. You can still use the Sell on Etsy app for SM. As for Instagram, since there are no clickable links (unless you go through setting up the ability to tag products) - so you may as well just post a picture, write a descriptions with hashtags, and say it's available in your Etsy shop. You can link one thing in your profile that people can click on (or you can post a linkin page with multiple venues)"
