Qt show modal dialog (.ui) on menu item click

[tomorrow]

void MainWindow::get_started_info()
{
    QMessageBox::information(this,"About","message");// dont forget to include QMessageBox
}

void MainWindow::get_started_info()
{
    QMessageBox::information(this,"About","message");// dont forget to include QMessageBox
}

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this works, when I click on Get Started, this message box appears

get_started *one; //in your mainwindow under private

get_started *one; //in your mainwindow under private

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like this :

private:
    Ui::MainWindow *ui;
    //! Create the menu classes
    void createActions();
    void createMenus();
    //! Menu Items
    QMenu   *home;
    QMenu   *help;
    QAction *quit;
    QAction *start;
    QAction *about;
    get_started *one;

private:
    Ui::MainWindow *ui;
    //! Create the menu classes
    void createActions();
    void createMenus();
    //! Menu Items
    QMenu   *home;
    QMenu   *help;
    QAction *quit;
    QAction *start;
    QAction *about;
    get_started *one;

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but I get an error 'get_started' does not name a type