Well what I've learnt about sub domains, it goes along the line of:

http://subdomain.domain.com

subdomain = Your chosen sub domain page.

domain = Global domain name for all pages.

If your page is or folder is http://www.domain.com/foldername/

Thats just a basic folder in your FTP not a sub domain try not to get the two confused

If you provide your host site and your site, I would be able to assist you more.

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