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qt - How to link a slot in the code with a QWidget in mainwindow

I am a beginner with signal & slots in QtCreator.

I would like to know how to connect a signal declared in mainwindow code in a Qwidget LCDNumber include in the mainwindow.

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Because even if my ManWindow signal is diclared correctly (I guess)

enter image description here

I can't configure the connection between MainWindow signal and LDCNumber Display(int) SLOT it in design mode :

enter image description here

Would you know how to code the connection of MainWindow SIGNAL declared in MinWindow's Class and LCDNumber include in Mainwindow's SLOT, please?

Here are all the propeties of QLCDNumber class :

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Thanks a lot!!

question from:https://stackoverflow.com/questions/65871400/how-to-link-a-slot-in-the-code-with-a-qwidget-in-mainwindow

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