Goto your %appdata% folder and open the .minecraft folder. Navigate to the bin folder and open minecraft.jar with you favourite archiving utility. This may involve renaming it minecraft.zip. Now all you need to do is drag the class files from the mod in there. There are hundreds of tutorials that explain this better, including lots of poorly made, needlessly long videos.
It's also worth looking into Magic Launcher. Technic Launcher if you're interested in the mods it supports.
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