How to import Android Support Library to project?

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http://stackoverflow.com – How do I import the Android Support Library into my Android Studio project? I need it to use fragments, apparently. I have downloaded the Android Support Library and the Android Support Repository from SDK Manager, and I've read that I'm suppose to go to File -> Project Structure -> Dependencies and click on the + button and add the file. But where do i find it? I have looked in the Android Studios folder but I can't find it anywhere? Thanks! (HowTos)