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1. Download font awesome and upload ENTIRE package to server
http://fontawesome.io/

2. Link to css
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">

or for wordpress, add this to functions.php (make sure version path is correct):
function add_scripts() {
	wp_enqueue_style( 'font-awesome', get_stylesheet_directory_uri() . '/font-awesome-4.5.0/css/font-awesome.min.css' );
}
add_action( 'wp_enqueue_scripts', 'add_scripts' );

3. Add HTML
<ul class="social">
<li><a href="https://www.facebook.com" target="_blank"><i class="fa fa-facebook-f"></i></a></li>
<li><a href="https://www.instagram.com" target="_blank"><i class="fa fa-instagram"></i></a></li>
<li><a href="https://www.twitter.com" target="_blank"><i class="fa fa-twitter"></i></a></li>
<li><a href="https://www.linkedin.com" target="_blank"><i class="fa fa-linkedin"></i></a></li>
</ul>

4. Add CSS
ul.social li {
	display: inline-block;
	padding: 0 0 0 10px;
}

ul.social li a i {
	color: #FFF;
	background: #000;
	width: 40px;
	font-size: 20px;
	height: 20px;
	line-height: 20px;
	text-align: center;
	padding: 10px 0;
	-webkit-border-radius: 50%;
	-moz-border-radius: 50%;
	-ms-border-radius: 50%;
	-o-border-radius: 50%;
	border-radius: 50%;
}

ul.social li a:hover i {
	background: #999;
}