1. Upload the "Fonts" folder and CSS file to your website's CSS directory.
2. Link the CSS file in the `<head>` section of your website. <head> ... <link rel="stylesheet" type="text/css" href="yourwebsite.com/css/flaticon.css"> ... </head>
3. Apply icon classes to your HTML elements, for example: <i class="flaticon-airplane49"></i> or <span class="flaticon-airplane49"></span>