Can you either take a picture of the label on the side or post what it says under 12v?
It should fit in the motherboard just fine. How to do it? Well you are going to have to remove the silver plate things covering the slots on the back of the case. Then you basically just slide the card right into the long black slot.
After you have done that, you connect the wires that look like this:
Into the graphics card, like so:
Then boot up your computer and install the drivers for the video card from the internet.
I would like to know that power supply information more than anything though.