How to verify a file on a root domain?

Hey there guys,

I accidentally made a post in the wrong section so I had to remake it here.

I need to verify a script for this website and they are telling me to upload a js file to the root domain of my site. Here is a photo off the site files that I deploy along with the script I am trying to upload.

How would I go about putting this javascript on the root domain so i can verify it for this website. To my understanding, I would just place it in the folder and then upload it. I will post a photo below of the deployment on my CF account too.

Deployment on CF account with the check permissions script on it.