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I can help you, if installed with steam, open my computer go to your hard drive, (Ususally C:/) now go to program files (x86) if that isnt there then go to program files now once you are there if installed with steam go to steam steamapps common kerbalspaceprogram gamedata and drag the "MissionController" folder into gamedata. if not purchased via steam, it should be Kerbal Space Program just sitting in one of your program files folders. if this is still confusing, and you DO HAVE the STEAM version, you can go into libraries, right click ksp, properties, local files on top, and browse local files. then open up gamedata and drag MissionController in, i hope i had helped!