In CSS:
.genericon-cart::before {
content:””;
display:block;
width:32px;
height:32px;
background:url(https://test-imc.littledropup.com/wp-content/uploads/Subscribe-32-BW.png) center no-repeat;
background-size:contain;
}
In Weaver Plus Social Buttons: Set the URL and Social Site Description under Cart.
In Weaver Admin > Main Options > Menus > Menu Bar Right HTML : [social font_size=32 color=#000000]
It brings up the cart icon. The link URL and the link description is what I put in. The icon is the cart, not the one I uploaded.