1) Turn off the Computer
2) You're first going to want to un-plug all power from the computer such as the power cords all of the USB's and everything else.
3) Open the side panel of your computer and look at the motherboard to find an empty PCI-I or PCI-E slot on your motherboard and then that is the slot your going to want to fit your graphic card in
4) Put the Graphic Card in lightly and make sure it's in and power up the computer and install the drivers it came with or get them from the website or it won't work display wise.
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http://www.youtube.com/watch?v=O9x097QRXeA[/video]