1. Copy the "Fonts" folder and the CSS file to your website's CSS directory.
2. Link the CSS file in the <head> section of your website's source code. <head> ... <link rel="stylesheet" type="text/css" href="your_website_domain/css_root/flaticon.css"> ... </head>
3. Add the corresponding icon class name to the element where you want to display the icon. For example, use the "<i>" or "<span>" tag and assign the "flaticon-airplane49" class.