You may be unable to access the ElephantDrive login page (e.g. 10.0.1.192/elephantdrive) from your QNAP interface. You may see an error, such as "The requested URL /elephantdrive was not found on this server". Below is also an example of what the error page may look like.
This is due to the web server being disabled on your QNAP. You need to enable the web server on your QNAP in order to access any GUI, including ElephantDrive.
To enable web server on your QNAP, go to Applications -> Web Server > check to Enable web server -> click Apply All.