Copy the 'Fonts' folder and CSS file into your website's CSS directory.
Link the CSS file in your website's HTML head. <head> ... <link rel="stylesheet" type="text/css" href="your_website_domain/css_root/flaticon.css"> ... </head>
Want to display an icon on your page? Just apply the icon class name to an element with `display: inline`. For example: <i class="flaticon-airplane49"></i> or <span class="flaticon-airplane49"></span>