1 - Loosen the screws on the blade holders with the wrench. 2 - Slide the blade under the square pressure plate until snug 3 - Securely tighten screws to assure the proper electrical connect. Do not over-tighten. 4 - Once the blade is firmly in place in the Thermal Cutter (Hot knife) Unit into a standard power supply. 5 - The temperature control knob has 16 k setting that correspond to the graduated rids on the surface. The smaller the rid the lower the power setting.