Copy-paste the few lines of script just before </body> in html that you’re using.
<body>
...your original code...
<!-- Start Oculus Analytics -->
<script src="<https://oculus-sdk.humanlabs.world>" crossorigin="anonymous">
</script>
<script>
window.oculusLayer = window.oculusLayer || [];
function oculus() { oculusLayer.push(arguments); }
oculus("app_id", "app_1234567890"); // Replace with your app ID
</script>
<!-- End Oculus Analytics -->
</body>