It depends on what type card it is. Most, I think, are pcie X 1 cards which means they fit into an X 1 pcie slot, but usually they can be installed in any pcie port. Turn off and unplug the computer, hold the start button down for 30 seconds. Just find the right pcie slot and remove the screw for the expansion slot in the back of the computer. Plug the card in and the backplate should line up with the expansion slot you just removed, the same as a graphics card. Screw the backplate down with the same screw that was in the expansion slot you removed. I wouldn't connect any hard drives to it. Plug the computer back in and restart. You should get a 'new hardware found' notice. Install the correct driver
for your card. Shut down and connect the hard drive, restart and go to disk management to see if it is recognized. If you need help identifying the slot types, look at the card pins on the bottom and line them up with one that will fit. Maybe this will help.