Login your publisher dashboard and follow this steps:
after add your domian / site, you need verify your site/domain.
- site
- manage site
- click on verify button.
Then open a window. here you can see file download option and meta tag are available.
if your site is built with blogspot/html/php, then you can download file and upload our file to the root of your site.
if your site is built with wordpress site, then you can copy the meta tag code and paste it head section of your site. For this you can use wp header footer plugin just install this plugin and our meta tag code paste on this plugin head section.
4. Finally, again come back your publisher dashboard and click on your domain verify button.

Very interesting details you have remarked,
regards for putting up.Blog money