Using this stove control knob kit is easy. First, find the old knobs on your stove that need to be replaced. Just pull them off gently. Then, pick the right insert from the kit for your stove's simmerstat shaft size. Put the insert into the new knob and then slide the knob onto the shaft. Make sure it fits snugly. When using the knobs, turn them slowly to adjust the heat. For example, turn it to 'LO' for low heat and 'HI' for high. As for maintenance, clean the knobs regularly with a soft, damp cloth. Don't use abrasive cleaners as they might damage the markings. If you notice any loose parts or issues, contact us right away. Also, store the extra inserts in a dry place for future use.