Google Webmaster Tools allows site owners to easily get information about how/when Google indexes your site, submit sitemaps, and track internal and external traffic. Before that can be done, however, you have to verify your site with Google. To do that, follow these steps:

1 - Login to Webmaster Tools at https://www.google.com/webmasters/tools/home?hl=en

2 - Add a new site, using the full URL of your storefront install as the URL. For example, if your site is in a subfolder, you would need to enter http://www.yoursite.com/subfoldername as the URL.

3 - When asked about verifying the site, choose the "Meta Tag" verification method.

4 - You will be given some code and told to insert that into your template. Instead of modifying the template directly, take the 'content' portion of the verification code, and put that in the GoogleWebTools.VerificationMetaTag AppConfig on your site.

For example, given this sample code:

<meta name="google-site-verification" content="QzVm_uTONI92WMYN6oSCyXGIVBNIajiYHp19Lj7tYWA" />

...you would enter 'QzVm_uTONI92WMYN6oSCyXGIVBNIajiYHp19Lj7tYWA' into that AppConfig.