If you have a Tier 2 hosting plan, you're required to place a sponsored advertisement on your website's index. The codes for displaying the advertisements are as follows;

Horizontal Banner; (dimensions 468 x 60);

<script type="text/javascript"><!--
google_ad_client = "pub-2302891582249869";
google_ad_width = 468;
google_ad_height = 60;
google_ad_format = "468x60_as";
google_ad_type = "image";
google_ad_channel = "";
//-->
</script>
<script type="text/javascript"
  src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

Vertical Skyscraper; (dimensions 120 x 600)

<script type="text/javascript"><!--
google_ad_client = "pub-2302891582249869";
google_ad_width = 120;
google_ad_height = 600;
google_ad_format = "120x600_as";
google_ad_type = "image";
google_ad_channel = "";
//-->
</script>
<script type="text/javascript"
  src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

Simply copy the advertisement style you wish to use, and paste it on to your website's index.