WDTV Live doesn’t support DLNA streaming on official firmware.
You need to install WDLXTV firmware, but this doesn’t include DLNA server but only client
See latest version at Cacoo.com
More information about DLNA and UPnP
To get DLNA server on WDLXTV you need to install a TwonkyMedia v4.4.18 download from here -> note this SW is not FREE but you need to buy a copy at Twonky website.