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You need to turn on the main gas supply and light BOTH the centre brown looking ones, these stay on all the time you are cooking, there is a control knob for the centre burners so you can adjust it to what size flame you need (we normaly cook with the centre ones because they are always on) The out black knobs will let you turn on the gas for the outer rings back and front.
Good luck and keep your head back so you can keep your eyebrows. Use a long lighter.