Being a complete newbie (I'm using Qt Creator 4.02 with Qt 5.7.0 [32-bit msvc2015] on Windows 7 Pro 64-bit SP1), I decided to start with "Creating a Qt Widget Based Application" at doc.qt.io/qtcreator/creator-writing-program.html .

Unfortunately, when I get to the step:

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The on_findButton_clicked() slot is called automatically in the uic generated ui_textfinder.h file by this line of code:

QMetaObject::connectSlotsByName(TextFinder);

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there appears to be no ui_textfinder.h file in my project.

Also, at steps:

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5. Select Add > Add Prefix.
6. In the Prefix field, replace the default prefix with a slash (/).
7. Select Add > Add Files, to locate and add input.txt.

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there appears to be no "Add" in either the menu or any of the context popups in the code editor.

The project compiles, but (after entering a keyword in the lineEdit) clicking the Find button seems to do nothing.

What am I missing?