Login or create a Google Web Master Tools account.
Click on the Add a site button and enter your site’s web address. example: themunroeseries.wordpress.com
On the next page, you’ll be asked to verify that you own the site being added. For verification method, choose Meta tag and copy the code provided.
Login to your WordPress admin portal and click the Editor link in the left hand column under the Appearance tab.
In the navigation located on the left hand column, find and click the Header (header.php) link.
In the theme editor, look for and paste the line or code you copied from Google Webmaster before </head>
Click the blue Update File button and you have successfully added your site to Google Webmaster.
Once you have confirmed your site with Google Webmaster Tools, you should register an XML sitemap with them.
Creating an XML sitemap for your WordPress blog.
Submit Wordpress sitemap to Google Webmaster