Hello,
You can check the available social media platforms from the Theme Settings >> SOCIAL PROFILES >> Share buttons. Instagram is not available for sharing and you can not add it inside those sticky buttons. Because instagram does not share anything by its nature, that is why you cannot add share button to Instagram.
To display the social icons on the left side of the blog post. You need to edit your post with Wp-Bakery page builder then select column as “⅚, 1/6”size, then move then ⅙ to first position and use the icons inside it.
Screenshot : https://jmp.sh/5NP1vlX
Result: https://jmp.sh/iNPLKX5
Best Regards.