Substack icon for social media

Hello,

Is there a way to ass a logo for substack to the social media icons. It’s not a default choice. I tried several solutions I saw online to generate an SVG icon and import it into enfold and trick the interface by using for instance behance and letting it replace the logo with code in the php files and css, but none of them have worked. Wanting to place it up top in this site I’m building out:

Thanks