Open index.html file and add given code
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css" integrity="sha512-z3gLpd7yknf1YoNbCzqRKc4qyor8gaKU1qmn+CShxbuBusANI9QpRohGBreCFkKxLhei6S9CQXFEbbKuqLg0DA==" crossorigin="anonymous" referrerpolicy="no-referrer" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/js/all.min.js" integrity="sha512-uKQ39gEGiyUJl4AI6L+ekBdGKpGw4xJ55+xyJG7YFlJokPNYegn9KwQ3P8A7aFQAUtUsAQHep+d/lrGqrbPIDQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
Sample html code to display a sample icon
<i class="fa fa-search" aria-hidden="true"></i>