Using this timer knob insert/cap is easy. First, turn off your washing machine and unplug it from the power source for safety. Then, remove the old insert or cap from the timer knob on your washing machine. Simply place the new black timer knob cap onto the plastic timer shaft of the timer knob. Make sure it fits snugly. When using your washing machine, don't apply excessive force to the timer knob cap as it may cause damage. Also, keep the cap clean. You can use a soft, damp cloth to wipe it down from time to time. If you notice any signs of wear or damage, it's a good idea to replace the cap to ensure your washing machine works properly.