I'm a visual person so I hope this will help you.
The compact flash card reader/writer hooks into one of the usb ports on your computer. The compact flash slides into it. Then you find your design on your computer and send to the card reader/writer. You then remove the compact flash and insert it into the compact flash pc card adapter. Take that and insert into the slot on your computer. All of these can be purchased at a computer store and sometimes at the dealer where you brought your machine.
Here are the pictures. Some of the newer computers have a slot where the compact flash can be inserted so you would not need the card reader/writer. Hope this helps you.
this goes into a USB port
this goes into the card reader/writer
this goes into the slot on your machine with the compact flash