F-keys not working as set in System Preferences

In System Preferences, under MIssion Control, "Show Desktop" is set to the F6 key. But my new macbook pro keyboard has the the F6 key set to turn on the backlight keyboard, and so with other F-keys. How do I "show desktop" with the keyboard, and why doesn't the F6 key work as set in System Preferences? Am I doing it wrong? Thanks.

Good day Arandel,
On a portable Mac such as your MacBook Pro to use the assigned functions from the Mission Control System Preferences, you must simultaneously press the function (fn) key in the bottom left corner of your keyboard, in your case fn + F6. See this article for reference -
OS X Yosemite: Zoom to Mission Control
Thanks for using Apple Support Communities.
Safe computing,
Brett L 

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