Hey dear @janesstylediary , the black Share button under your set can be used to share either set link (first option) or embed your set on your blog (second option)
You can use set link on social media, for example. I usually download the set picture and paste the set link in the description of the photo when I share my work - I do that because the thumbnail won't load sometimes.
As for embedding the code, you can find more details about this option here: https://blog.hubspot.com/marketing/how-to-add-html-embed-codes-ht.
Hope this helps. Have a great day
P.S. This is the window that should open when you click that Share button:
... Read more