MacBook Pro (Retina, 15-inch, Mid 2014) -- Enable NVIDIA GeForce GT 750M ?

Hi
I got a MacBook Pro (Retina, 15-inch, Mid 2014) running on Yosemite.
I wonder how is possible to enable the NVIDIA GeForce GT 750M card?
I am looking around but I cannot find documentation explaining about how to enable the other video card.
Any tips/help?
Thanks

Check System Preferences>Energy Saver>Graphics Switching.
Ciao.

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