Modifying a visual studio project

Hello to everyone.

First of all I am not sure if this is the right forum to ask it, but I am quite sure that my question will be easily answered by any of you.

I got a driving simulator (already working) made with microsoft visual studio, which I will have to do some modifications in. This simulator uses Qt creator for running the simulation .

It works either in debug or release mode, but for instance I would like to be able to execute it step by step, and I don't know how to do it. I simply runs the simulation when I try it.

My second enquiry would be asking for some source of information about how this works (visual studio using Qt creator for graphic interface) in order to get some understanding.

And then, there is another problem that I would like you to help me with. The .vcxproj file is already made, and I want that the modificatations that I make to the source files, being reflected in the simulation.
I check this just changing some of the messages the simulation shows, it keeps showing the original message instead. Do I need to create another executable file or something, or I need to make a new project anytime I change something.

Thanks in advance, goodbye.
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