Steps to Verify your Blog in Webmaster Tools:-
1. At first go to Webmaster Tools Homepage then select your site.
2. Now click on Manage Site in right side, then select Add or Remove Users.
3.Now click on Manage Site Owners and go to Verify Using Different Method.
4. Then select HTML TAG. A meta tag code will be appear.
5. Now open your Blogger template in new tab of your browser and select Edit HTML.
6.Now paste the meta tag below <head> and save the template.
7.Again open Webmaster tools tab and click on Verify button at bottom side.
You will see the congratulations message that you've successfully verified your blog in Webmaster Tools.