How do I install themes & movie covers?

I just purchased a WD TV Live media player recently. I’m streaming all my videos from my a folder on my PC to TV. When I bring up my movies and tv shows on my box it just shows a blank thumbnail. Is there anyway to add covers and such? Also, there is a User Interface Theme page when I bring up WDTV settings in my browser. How do I use themes?

I would suggest you spend some quality time with the User’s Manaul, as all of that is discussed in there.

But briefly, the covers are .metathumb (jpegs with a different extension).   The description, plot, etc. are stored in XML files.

The WDTV can collect it itself via the Content scraper, or you can use a myriad of third-party tools to generate all of that more or less automatically.

Themes are also discussed in the manual.