Android Box Navigation Help (where's my app manager?)

I’m using the Unblock Android Box as a replacement for my EEE PC.
It really works great as a client for my shared drive and it’s a great video player.

However, I can’t seem to easily access background applications.
Example: I’m playing an MP3 from our language textbook in ES Media Player.
A kid grabs the mouse and clicks, I’m no longer in ES Media player but in ES File manager or another app.
The file continues to play. I can’t seem to find the ES media player window. It’s gone. The only way I seem to be able to stop the video or audio is to go back into ES File Manager and click on another media file.