You can search for a specific speaker, date, month, year, or message title. Type what you are looking for into the "Search all media" box located above the recent media section.
In this section, you will find the four most recently added messages.
Individual Messages or Series
Messages which are not part of a series are organized by year. In order to locate them, you would need to access Individual Messages 2017 or Individual Messages 2016. Messages that are part of a series are stored within the series.