Click on the green plus sign after you selected the signals Slots Editor. It will give you 4 fields to fill in. For sender you select what is creating the signal. For example ActionExit might be the name you created for the exit menu item. The signal is probably going to be clicked(). The receiver is usually the class that you created that has all of your methods. The slot is the method you created in that class that you want to execute. For example:
actionExit clicked() <nameOfClass> exitGame()
Hope this helps.