agfutbol

I am a fairly new player and I am trying to use Mechjeb. I am using a mac. I have downloaded the most recent mechjeb and have copied it into KSP. I went into ksp, then game data, then posted the whole file there next to the squad folder. That is all i have downloaded and done. When I start up KSP, I get an error message saying that Mechjeb is not correctly installed. The incorrect path says Gamedata/Mechjeb2/Plugins/Mechjeb2.dll. Can someone explain what I am doing wrong? thanks!