Verification issue

I was fixing my ads through the plugin, not realizing that a friend of mine was signed into his gmail account on my computer. When going to correct the ads it attempted to sign in and verify, now my friend is verified under the webmaster tools and it will not let me remove him because the meta tags are active.
I cannot find any location where the meta tags can be access to remove it. Where would I go to remove the meta tag so I can kick him off of the webmaster tools.

https://www.ads-software.com/plugins/google-publisher/