Share folders from WDTV live

I connected 1Tb external HD to WDTV live. From my PC, I can access WDTV and view the files on my external HD. But i am unable to edit it (copy files to it).

Is there any way, I can copy files to my External HD via WDTV live.

What happens when you try to do that?

Are you getting an error?