Other Social Media Icons

I was wondering if it was possible to add a social media button for a social media outlet that isn’t on the list provided by the Customizr appearance settings.

Like I can see the link to include for FB, Twitter, Instagram and such, but I’d like to add a button for honestbuildings.com to my header/footer.

Anyone have any idea how I can do this? (I also have no css skills whatsoever