Qt Creator is a glorified text editor. VLD and Qt Creator are unrelated.

I think the opening line from the VLD web page says it all,
Visual Leak Detector is a free, robust, open-source memory leak detection system for Visual C++
(emphasis is mine)

If when you say "Qt Creator" you mean the MingW/gcc compiler that is bundled in the Qt SDK... The bundled compiler is not the Visual C++ compiler... so start here or here

If you are using the Microsoft compilers, i.e. from Visual C++ or one of the Windows SDKs, to build your Qt application then you should be able to use VLD as advertised.