On your PS3 go to Settings > Network Settings > Media Server Connection > On
Then under Video / Music / Photos on the PS3 select “Search for Media Servers”
(make sure the WDTV Live Hub DLNA is enabled Setup > Network Settings > DLNA Media Server > On )
For future questions regarding your WDTV Live Hub please post in the correct forum (This is the WDTV Live Streaming forum)
WDTV Live Hub Forum: http://community.wd.com/t5/WD-TV-Live-Hub-Discussions/bd-p/wdtvlivehub