You can add a
<meta> tag containing the authentication code to the <head> section
of your default webpage.
<meta
name="msvalidate.01"
content="D1BC405F8B4CFBB615C63757C59252C9" />
An example:
<html>
<head>
<meta name="msvalidate.01"
content="D1BC405F8B4CFBB615C63757C59252C9" />
<title>Your SEO optimized title</title>
</head>
<body>
page contents
</body>
</html>
