Hi there!

I wanted to remove a duplicated site from the google index. I've read that you can do this by removing the URL from Google Search console and, although I can't find it in Google Search console, Google keeps on showing the site on SERPs. So I wanted to add a "no index" meta tag to the code of the site however I've only found out how to do this for individual pages, can you do the same for a entire site? How can I do it?

Thank you for your help in advance!

L