Remove Verified User Meta Tag

Here’s my site:
Champagne Tastes

I was using a multi-user computer at work, and someone else was logged in on their Google account. Somehow I accidentally added them as an authorized user on my page! I’ve tried going into Google webmaster and clicking “unverify” – but it says I have to remove this meta tag:
<meta name=”google-site-verification” content=”Uf-a7YzimLImxu-fj73jwG3UEw2fGxpphIG3n4mALng” />
Can someone tell me how to do that? I don’t know where the meta tags are located. Help!! Thanks!!

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