"First, you have to signup for the Google webmaster tool.
After you join you need to go through the verification process so that Google knows you are the legit owner of the site and you want to use Google Webmaster Tool on.
There are several tips to verify your account:
1. Download HTML file and to upload it to the root directory of your site.
2. Add an HTML tag to the head of your home page. If you are using the same Google account for google analytics.
3. verify ownership is through Google."