Minecraft Mod folder/Galacticraft Mod/ I'ma freaking idiot help?

I don't have or know how to get a mod folder into my 1.8 Minecraft game, and I would very much like to play Galacticraft Mod. Can anyone please help me? I'm desperate at this point after scowering everywhere. The Gakaticraft has 3 files that need to be in the mod folder, so the deleting the META file didn't work (and if it's suppose to, then I clearly ****** up and need a step-by-step, explanation for a simpleton such as myself).

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