Accessing html header to add meta tag with Page Builder active

I am trying with no luck to add my site to Google webmaster tools. I need to add a meta tag in the html header section to do this, but I cannot find a way to access this with Page Builder active.

I can add the code in the html editor, but the revert option says I’ll lose all my Page Builder created content. I really really really do not want to recreate all that. Please tell me there’s another way.

Thanks,
Annie