On the setup page of your router, select the USB settings tab on the left and then make sure your USB settings are set for Shareport. After you have done that, go to your router status page and see what firmware you are running. If you are running Firmware 1.31 or higher you need to install and run this PC SharePint Utility Program
ftp://ftp.dlink.com/Gateway/dir655/Apps/...port_utility_110.zip.
If you are running Firmware version 1.21 or prior, install and run this SharePort Utility
ftp://ftp.dlink.com/Gateway/dir655/Apps/..._USB_Utility_114.zip.
If it's still not working correctly after you have done this let me know. Also let me know what Firmware Version you have on your router.