Sign up for Google Webmaster Tools: Use the link in Resources below, click on the Google Webmaster Tools homepage. On the right side down, click on “Create an account now.” Follow the instructions on the screen to your account. Once you are logged in, return to Google Webmaster Tools homepage to log in

GET verification code: You should now be on the board of Google Webmaster Tools, where you can use your Blogspot URL. Make sure you include the full address of the page:

http://yourblogname.blogspot.com

Once you click on “Add Page” will take you to the page. Click on ‘Make your site “link. From the drop-down menu, select” Add a meta-symbol’ option. Copy the meta tag Google generates the code.

For yahoo

Go to https://siteexplorer.search.yahoo.com/

Login with your id

Choose add your site.
Then click on website name then click on authentication tab choose >> By adding a META tag to my home page.Grab that code and paste it in blogspot theme as define below.

For msn

Go to http://webmaster.live.com/

Login with your id

Now on the left side choose click on add a site.Now enter your Blogger site address.Leave other fields if you want to or fill them.now it will ask you to authenticate your ownership of your website.Take the meta tag authentication option and get code.

ADD BLOG Verification Code: In a new browser window, go to Blogger Dashboard and click on “Layout” on Blogspot select the “Edit HTML”. In the template edit screen you will see HTML template for your blog. Back to the top you can see the header tag. If you need help, click on the image left to enlarge and display the correct location meta tag.

Place the meta tag you copied from Google ,msn ,yahoo directly under the head tag. Save the template.

Confirm your blog VERIFIED: Back to the Google Webmaster Tools,yahoo siteexplorer and msn webmaster tools  and click confirm button.They will confirm that you receive the meta tags to your Blogger, and will immediately be able to use a range of instruments and reports.