USB external harddrive via LibreCMC router

I have successfully installed LibreCMC on my router. The router has a USB port in which I have plugged an external harddrive. This worked well with my former (non-free) router, but it doesn't now. I cannot remember if I did anything in particular to make it form earlier.

The LibreCMC web-interface has no menu entrance for USB, so I feel kind of lost. When I plug the hardrive in the USB port of the router, the LED lamp flashes on the harddrive, but soon after turns off.

I have tried to mount the harddrive via cifs as described here: 1) sudo apt-get install cifs-utils
2) Added //192.168.10.1/USB_Storage /media/hddmount cifs guest 0 0 to my /etc/fstab

hddmount being the place were the drive is intended to be mounted.

I can see an icon of the network folder on the desktop, but when I click on it, I get the message: Failed to mount "hddmount"
mount: only root can mount //192.168.10.1/USB_Storage on /media/hddmount

When I enter '192.168.10.1/USB_Storage' into the browser, I am told that Not Found
The requested URL /USB_Storage was not found on this server.

Any suggestions of the underlying problem and/or solutions?