Download and unzip random-posts-mp3-player-sharebutton.zip to your plugin folder.
Activate the plugin from the Plugins menu of your wordpress dashboard.
Go to the "Random Posts, Mp3 Player + ShareButton" options in your dashboard check "Display Random Featured Post", define number of posts to show, widget placement, background color and categories you would like posts to be randomly selected and define other options.
Since from v1.0 to 1.4 there's always new feature added, try to deactivate and re-activate the plugin manually to let the plugin create new table to database.
Requires: 2.8 or higher Compatible up to: 3.5.2 Last Updated: 2013-1-1 Downloads: 6,737