how to open nikon raw files

How to open NIkon D90 raw file in photoshop CS4?
I just started to learn photography and photoshop. I have NO idea what I am doing. Please help !!!
I can’t open raw file from Nikon D90. I already down load a plug in but still don’t what to so next.
Can anyone give me an instruction…steps….how to open my file?
By the way, I am using MacBookPro.
i use lightroom, you can view all your images off a device like if you’re using a card from your cam. it displays a gallery style of your images and from there you can choose which to export to PS, you can also change the format to JPG of TIFF.
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