Locate the gas regulator on the back of the range on the bottom left-hand side. There will be a dial on the regulator to control the size of the orifice. Turn the dial to 11 for propane conversion.
Lift the burner grates and covers from the range to access the gas lines that supply them. Match each propane orifice with each burner by looking at the part numbers.
Tighten the propane orifices to the burner orifices with a wrench to convert your Frigidaire range from natural gas to propane. Replace the burner grates and covers onto the range once you've finished the conversion.