Dolphin Social Network is giving me a trouble

About an hour ago i installed dolphin social network, but it keeps giving me the same error message, here it is (Not Found

The requested URL /login was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.) But all name servers are pointing to infinityfree on domain name register. Please help, Im browsing a correct domain name even when i browse it through the installer it gives the the same message.

Did you install the script manually or move it from another hosting provider? If so, make sure the file .htaccess was uploaded as well.