1. Grab the 'Fonts' and CSS files and place them in your website's CSS directory.
2. Link the CSS file in your website's header section: <head> ... <link rel="stylesheet" type="text/css" href="your_website_domain/css/flaticon.css"> ... </head>
Just drop the icon class into your inline elements. For instance, use <i class="flaticon-joystick"></i> or <span class="flaticon-arrow-up"></span>.