Without access to the FTP, how can I fix the index page?

Even though your subsequent comments indicate the problem was fixed, you didn’t mention ‘how’ you fixed the problem.

So I have added this answer for anyone else wandering by this question.

But if the issue is not forcing HTTPS, then this is more properly done with settings in your HTACCESS file (which someone with file access will have to do).

A generic htaccess fix is: 

RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

This will rewrite all requests to HTTPS, no matter what URL is requested. It should be placed at the top of your htaccess file, before the WordPress block.

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