A stove knob is made of plastic or steel. If you have pulled the knob slightly off the post, you can put it back very easily. However, if it is broken, you need to replace it. * Turn the stove knob towards the “Off” position. * Push the knob steadily back into the knob post. Make sure it is in the same place as other knobs. * If the knob is broken or damaged, pull it off from the stove. If you can’t remove it wrap a wire around it and pry it off. * Align the grove of the new knob with the grove of the knob post. * Push the new knob into the knob post until it comes at the same level as other knobs