Changing from natural gas to propane

Hi,
You will need to contact the manufacturer for replacement burner nozzles. As Propane is at a higher pressure, the nozzles need to be smaller in diameter.
You will also need a tank fitting for Propane with a regulator attatched - and a large spanner to attatch it.
Make sure any pipe connector to this is fitted with an approved hose crimp, as "jubilee" type clamps are not recommended.
If you just fit the regulator, the burners can flare dangerously on the high settings - unless it has been designed to be dual fuel originally, and have replacement nozzles.