How do I get the knobs off the old part and then how do I put them on the new part?
The knobs for the clock timer are attached to a shaft and they are just rubber knobs. When you pull the rear cover of the control panel off and take the clock out, the shafts for the knobs should be exposed and you can push the knobs out.
Our oven is burning our food and we get an F1 code. Other than that, the oven is running and the clock and timer work. Any suggestions on which part to replace?
The F1 error code indicates a runaway temperature. You will want to test the oven sensor for resistance. The resistance value should be 1090 ohms at room temperature. If the sensor does not have this resistance then you will need to replace the sensor. If the sensor checks ok then you will need to replace the oven control.