Hello,
We can’t see your site still. What access should we use to pass this popup – https://gyazo.com/93011601cb5a4c2435d9b80571643d1e ?
You forget about FTP access. We need FTP: FTP host, FTP username and FTP password with access to your WP installation files. Contact your hosting provider if you don’t know what FTP is.
Regards