1. Copy the "Fonts" folder and CSS file into your website's CSS directory.
2. Add the CSS link to the `<head>` section of your website. <head> ... <link rel="stylesheet" type="text/css" href="yourdomain.com/css_root/flaticon.css"> ... </head>
3. Apply the corresponding class name to inline elements where you want to display an icon, for example: <i class="flaticon-airplane49"></i> or <span class="flaticon-airplane49"></span>.