How to use a bone folder?

 Here are the Instructions for bone folder use:

• 1:Position the edge of your clear-grid ruler on the paper you are using. The clear grid allows you to align the ruler without having to mark the paper with a pencil.
• 2:Place the tip of the bone folder against the ruler's edge. Firmly press the point down while pulling it along the ruler's edge. Press hard enough to leave an indentation on the paper, but not hard enough to tear or cut through the paper. This is called scoring.
• 3:Fold the paper at the score line. Stand the bone folder on one of its long edges. Firmly press the edge down and pull the bone folder back and forth along the fold. This will give the folded edge a crisp finish.