You can play the file or add it to the Quick Play folder.
1.
In the Navigation pane, click Library.

2.
Drag a file onto the Quick
Play link in the Navigation
pane.
The file is only played if the Quick
Play pane is empty. If there
is already a file in the Quick
Play list the file will not
be played automatically, it is simply added to the bottom of the list.
OR
Right-click on the file you want to play.

3. Click Play.
1.
In the Navigation pane,
right-click Library.

2.
Click Play.
You can now use the Shuffle
and Repeat All buttons
on the left-hand side of the media player control panel.