Problem displaying my main window

[Salazaar]

Hi. I've got a question. I have created my main window using designer and translated it into Qt code. So after translations I received a ui_Maker.h file:

http://www.insidetennis.yoyo.pl/ntd.txt

And how can I display this main window (called MainWindow) ?
I tried this in main.cpp:

#include "ui_Maker.h"
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow->show();
    return app.exec();
}

#include "ui_Maker.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow->show();
    return app.exec();
}

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but there appear error that MainWindow is undeclared. What did I do wrong? And how can I correct it? Btw. my test.pro file:

CONFIG += qt
HEADERS += ui_Maker.h
SOURCES += main.cpp

CONFIG += qt
HEADERS += ui_Maker.h
SOURCES += main.cpp

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Regards