Some vendors will direct you to cut halfway through the stock with a sharp knife. I've never found that necessary and you run the risk of cutting all the way through the card stock.
Here I've used the backside of a single edged razor blade. The rounded metal fold over the back of the blade works very well to set the crease. You can also use the tip of a butter knife, just the tip above and serrations.
You should practice a few creases outside the printed cover areas. Draw a pencil line, line up your straight edge and run the blade back over your practice lines. When you feel comfortable with it, then move over to the real fin covers. When setting down the straightedge, you do have to allow for the thickness of the back of the razor blade.
After the creases are made, I used the back of a Sharpie barrel as a burnisher to "set" and sharpen the crease.
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