It’s time to implement your ad code
We’ve noticed that you’ve successfully created your first ad unit, but you haven’t placed your ad code on http://example.com. This step is necessary for the full activation of your account. Please sign in to AdSense to get the ad code for the ad unit that you’ve created, and then place the code on your site.

If you believe that you've implemented your ad code correctly, but our servers are still not seeing it, make sure that your code is on a page that's receiving traffic from visitors to your site.

For more help, please see our Code Implementation Guide.
Place the ad code