As long as your motherboard is new enough, you will be able to purchase a PCI card that plugs into the PCI bus on the motherboard.
Another option is a pci card that has a wire which connects to a set of pins on the motherboard in an arrangement something like this:
Depending on the age of your computer, and whether or not it has front USB ports it may be necessary to disconnect these to plug the card in.
Hope this helps
PS. If all else fails, the manufacturer's website should always help.