Western Digital WDBMBA0000NBK User Manual page 48

Use the navigation buttons to select the media file you are looking for, and then
press OK or to initiate playback.
Manual Search
You can manually search for a media file by navigating to the My Storage app,
selecting a source (see "Accessing Media Content" on page 24 for details), and
browsing through the available files and folders. This method is recommended if
there are only a limited number of files to search through. Otherwise, it is better to
use the built-in Search function.
WD TV Play Media Player
User Manual
SEARCH – 43