How do you install a mod for Minecraft?

I want to install a few mods for Minecraft such as Wrath of the Fallen or Hunger Games and so forth but I'm not to sure how to. I have looked at other answers on how to but they don't make sense to me. So if you please explain each step clearly that would be appreciated (just pretend your explaining to a 8... show more I want to install a few mods for Minecraft such as Wrath of the Fallen or Hunger Games and so forth but I'm not to sure how to. I have looked at other answers on how to but they don't make sense to me. So if you please explain each step clearly that would be appreciated (just pretend your explaining to a 8 year old hahah). Lastly, I don't have a Minecraft.jar folder that everyone is talking about and I'm not sure why. Forgot to mention I have Windows 7. I would love the help :)!!!!
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