Using this St George hotplate simmerstat control is easy. First, make sure your stove is turned off and unplugged. Then, install the switch using the 10mm threaded shaft in the appropriate place on your cooktop. Once installed, plug in your stove and turn it on. You can adjust the heat level as needed with the control switch. When using the switch, avoid applying excessive force. Keep the switch clean and dry to prevent any electrical issues. If you notice any problems, like a loose connection or if the switch isn't working properly, turn off the stove immediately and contact a professional for help. Regularly check the switch for any signs of wear and tear. With proper use and maintenance, this hotplate simmerstat control will serve you well for a long time.