After you've generated the AdSense code, you need to paste it between the <head>
and </head>
tags of your site. We recommend you place the AdSense code on every page across your site to get the most out of AdSense.
The following examples show you where to place the AdSense code:
Example HTML page before the AdSense code has been added
<html>
<head>
This is the head of your page.
<title>Example HTML page</title>
</head>
<body>
This is the body of your page.
</body>
</html>
Example HTML page with the AdSense code added in the <head>
tag
<html>
<head>
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1234567890123456" crossorigin="anonymous"></script>
This is the head of your page.
<title>Example HTML page</title>
</head>
<body>
This is the body of your page.
</body>
</html>