Need help writing my first Qt app

[tbscope]

I've dragged and dropped the required buttons and labels onto the "mainwindow" I can't seem to add functionality to it. I guess my problem is that I don't know 'where' to write the code for the slot. Say a push button emits the clicked signal, where to I write the slot for the processing that is to take place?

The code goes into mainwindow.h and mainwindow.cpp
See the tutorials on doc.qt.nokia.com