Using this Prodigy oven thermostat is straightforward. First, make sure your oven is turned off and unplugged for safety. Locate the old thermostat in your Kleenmaid or Whirlpool underbench or wall oven and carefully remove it, noting how the wires are connected. Then, attach the new thermostat in the same place, connecting the wires to the 6.4mm spade terminals. When installing, ensure the mounting holes (28 mm apart) align properly. As for the capillary with the 19cm bulb, place it in the appropriate position inside the oven. Once installed, plug in the oven and turn it on. Set your desired temperature between 50 - 300 degrees Celsius, and the thermostat will do its job to maintain the heat. For maintenance, keep the thermostat clean. Wipe it gently with a dry cloth to remove any dust. Avoid using harsh chemicals or abrasive materials as they could damage the terminals or the contacts. If you notice any issues like inaccurate temperature readings, it's a good idea to check the connections or consult a professional. With proper use and care, this thermostat will serve you well for a long time.