Brace yourselves, this is going to get SO COMPLICATED. LOTS of steps.
Nah, I'm joking. This is super easy.
Step One: Open the case and remove the old paper (if it's still in there)
Step Two: Take the two sections apart.
Step Three: Turn the top part around.
Step Four: Carefully shove that top part into the bottom, lining the peg and holes if you can. You're just re-assembling it backwards.
Step Five: Adjust as needed so it stands up and the top part leans back slightly. Add a bit of tape on the bottom across the two pieces so they don't wiggle.
Step Six: Add your business cards and admire your amazingness.
Step Seven (optional): Make more because you are a friggen boss.