I wrote up a [tutorial][1] that just covers making a button in NGUI from scratch. As fffMalzbier said, you basically just need a script that does something in the OnClick () method, and the code inside is executed every time the button gets clicked.
[1]: http://unity3dtrenches.blogspot.com/2013/08/unity-3d-how-to-create-simple-button.html
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