First, I disconnected the power cord then I removed the panel that held the knobs in place. Then I pulled the center holding clip, what holds the knob secure, with the screwdriver and the broken knob slipped right off. Then I put the new knob on the shaft and slid the holding clip on the backside of the panel. Lastly, I put the panel back and screwed it back down and that's all. Works like nothing ever happened.