alienware 14 not using or seeing Nvidia GTX 750 GPU/only using integrated GPU

i have a alienware 14, and it will only use the integrated intell GPU but i what to use the Nvidia GTX 750 that is in my computer but i cant figure out how to get it to switch over. i tried the FN+I/D GFX keys but that just says it dose it automatically for me, but it dose not. i tried going into bios and theirs nothing there. please help