Look for Google Search Console (previously known as Google Webmaster Tool)
Step 2: Login with the email used for your blog
Once logged in to your webmaster tool account, click on add property and paste the URL of your blog into it.
Step 3: Verify Ownership
Verify ownership of your blog by selecting "Alternate Methods", then click "HTML Tag".
Copy the HTML tag and paste it into the “Google Webmaster Tools” field. Click on "save changes" when completed.
Then, click “Verify” in your Google Search Console. A successful verification message will be shown.