Unlike WDTV LIve HUB, WDTV Live SMP requires you to upload your user supplied Themes using a Browser
Get a user generated theme from WDTV Live HUB or you can use for example MOJO theme by Tinwarble which was modified to work with WDTV Live SMP
The process of loading the Modified theme into the Flash memory is to use a Browser and use the IP address of the
WDTV Live SMP
http:// --- You can also use DNS names like "wdtvlive"
You will be presented with a WEB interface login, You need to enter password "admin" for the first time and from there you can upload your ZIP file
If the contents of the theme present in the ZIP file validates correctly, it will be flashed into the WDTV Live SMP player, If all goes well, You will see the new theme appear in the local content your WDTV Live SMP player in the user themes section alongside with the default Mochi Theme.
Hope this helps