I have problem accessing homepage index.php when entering the url http://67.159.44.58/~whitncom/

I dont intend to sign up for domain name, just want to use the given IP Address with the folder name created by my hosting provider.

Anyway, I can only access my home page if I enter http://67.159.44.58/~whitncom/index.php

But when i click on the "Watch" link or after user login, it gives me the following msg:

Not Found
The requested URL /home/whitncom/public_html/user.php was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Thanks