Replace "Your-Cart" from topbar with icon

Hello,

my friend uses the Virtue 3.0.2. Theme.

Everything’s fine except the topbar. I tried to remove the “Your Cart”.
I found this in another topic.

.kad-cart-total {
position: relative;
}
.cart-contents {
text-indent: -9999px;
min-width: 70px;
}
.cart-contents .amount {
text-indent: 0;
position: absolute;
right: 10px;
}
.cart-contents .amount:before {
font-family: FontAwesome;
font-weight: 400;
font-style: normal;
text-decoration: inherit;
-webkit-font-smoothing: antialiased;
line-height: 1;
text-transform: none;
content: “\f07a”;
padding-right: 10px;
}

Now the “Your Cart” is gone but it shows “\f07a” now.
How is it possible to insert a cart icon like he did?

thank you for any help!