i found this online: The easiest way to do this is to “add a meta tag to your site’s home page“, so choose this option. Google will generate a meta tag for you. You need to copy this tag, go to your blog’s template folder (or Dashboard => Appearance => Editor) open your header.php file and put meta tag somewhere between head section:
<head>
…
…
put it here
</head>
Save your header.php and click “Verify” on “Verify ownership” page.
what do you think