The html file just needs to be uploaded to your public_html for your main domain or the folder you installed your website in. Please see the following link on this.
What Directory should I Upload my Files to?
You will need to access the cpanel file manager to so this. If you have not accessed the cpanel, please see the following links on how.
How to Log into cPanel
Using the File Manager in cPanel
Once uploaded, you should be able to verify your site right away. If you have any trouble, you can contact support to upload the file for you by chat or phone.
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