Mazda Repair: headlights, lowbeams, spring clip

Question
I was wondering how to replace the regular lowbeams with the sylvania ones. I read the answer but did not understand it. The casing seems impossible to get off. Its a 4 cylinder, 2003. Can you help?

Answer
there's some covers that need to be removed in the back of the light, i think the low beam ones are the ones furthest outside and you should see a round cover just un-screw the cap and then you got to un-hook the spring clip to remove the bulb.and yes, it's not easy  gets me frustrated also. also, i dont see any difference with those bulbs or the factory ones  but thats up to you