Hello,
1/ We can see the next on your site – https://prnt.sc/L6zppVIARdrQ
Point is that the Instagram app does not have a share option, it does not allow sharing, so you can’t implement this and unfortunately, there is no such option in our theme for now as well.
2/ Color can be changed using custom CSS code, for example:
.single-product .menu-social-icons i {
background-color: red;
color: #222;
}
Regards