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How to select your USB Headset as the Default Device on Chrome Operating System

In order to select your USB headset as the default device on a Chromebook; click on the avatar icon in the lower right hand corner next to the time.  This should bring up a menu that has an icon that looks like a USB plug.  Click on this icon (marked in red in the screenshot below):

Chromebook

This will generate another menu that lists your input (microphone) and output (speaker) devices.  Make sure that there is a check mark next to your USB device for both input and output.  If it is not checked, click on it to select it as the default device.  

check mark next to USB device