where is cylinder# 3 on my Kia Rondo Ex 6 cylinders?I have a cylinder3 miss fire on 2007 Kia Rondo

I received a code say that it was a cylinder 3 miss fire. I changed the spark plugs and still doing it. Do I need to change the injector or the ignition coil?
Kia Rondo Ex (6 cylinders)

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1 answer
Middle cylinder on firewall side of engine. Starting at serpentine belt side on engine Firewall 1 3 5
Radiator side 2 4 6.