1. Copy the 'Fonts' folder and the CSS file into your website's CSS directory.
2. Link to the CSS file in the <head> of your website's source code. <head> ... <link rel="stylesheet" type="text/css" href="your_website_domain/css_root/flaticon.css"> ... </head>
3. Add an icon class to your inline elements: Like this: <i class="flaticon-airplane49"></i> or this <span class="flaticon-airplane49"></span>