It's installed by default.
Go to your app drawer -> settings -> edit (it'll ask for you to accept the customizable grid, choose yes.) drag, drop, rearrange whatever you want, however you want (up to 5 INCLUDING the Home.) You can't move the Home/Applications button however. Settings -> Save when you're finished then go back to the app drawer if you're not already and settings -> View Type -> Alphabetical Grid/List, whichever you prefer and you're finished.
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