When I saw this card on SplitCoastStampers I was like "WHAT????!!" no way can I do that!" - then I saw the instructions and it is so SIMPLE!!!
First of all you need a piece of cardstock 12" x 5.5"
Next you need to score it at 2" 4" 8" and 10" from one edge:
So it will look like this:-
Now you need to cut the slit across the card:
Measure in 1.5" from the TOP of the card and then mark a line from the 2" to the 10" line -
you will cut along this line with a craft knife.
Flip the card around so the bottom of the card is at the top and again measure in 1.5" from the TOP of the card and then mark a line from the 2" to the 10" line and cut here too.
You will now have a slot like this:
It is along the 2" to the 10" score lines and 1.5" in from the TOP edge and 1.5" in from the BOTTOM edge of the card.
OK so the last part of the card making is to fold along the score lines.
The Section of the card that's been cut folds the opposite direction to the folds in the main card.
Take a look at this photo taken from above- it's quite straight forward!