I have been asked by Google to add a code to the root directory of my website..This is to prove ownership to Google so I can continue to disavow bad backlinks

Question:
[How do I add code to my websit root directory]

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Using Wix Studio Editor?
I am trying to follow Googles directive to identify me as the website owner by inserting their code into the rood directory of my website.
I added the code to the header and Google told me I was in error.
Help!! the code is : google-site-verification: google52edf68712f18de2.html