How to use: Insert paper in trimmer by placing it under the clear bar. Cut paper by pressing on the square blade cutting and sliding it up and down along the clear bar. Remove paper from trimmer by raising the clear bar. How to change blades: Slide blade carriage to the blade removal groove near the bottom of the clear bar pull up on the carriage to remove. Set the new carriage into the groove and slide it up the clear bar to set in place. Replacement Blades are available in our Walmart store. Package Includes: 1 x 12 x 4.5 Bira Craft Paper Trimmer.