Embed HTML in collection

I have tryed to implement Waldo’s sharing buttons/links ( FREEBIE: Sharing is Caring :) - Show & Tell - Forum | Webflow but It is not opening as expected:

https://preview.webflow.com/preview/1pure?preview=8d8058a84f2b7c9a0bab413085ce0bd1

https://www.1pure.com.br/post/the-cannabinoids-as-potential-antiepileptics![|690x351](upload://2ZkI08ixeBNhcXBtobZq9oSSVtZ.jpg)