1) Go to Google web master tools www.google.com/webmasters/tools/
2) Login with your gmail account
3) Once logged in "add a new site".
4) It will provide you with a META TAG content. Either you can VERIFY the site at this point or you can VERIFY LATER.
5) Add it in your blog site HTML page right at the top
Do edit your blog here are the steps
Click on the Layout --> EDIT HTML
6) Add this META tag from web master.
7) Allow 3-4 days for Google to pick your blogs.