You have to match a C++ compiler/toolchain to a set of compatible Qt libraries in order to make a Kit. You then associate one or more Kits to your project from the Projects panel.
You have Visual Studio 2010 and 2013 installed and you have downloaded a bundle containing Qt libraries for Visual Studio 2012, so the first step will be difficult. To use the VS2013 compiler or VS 2010 for 64-bit you will have to build Qt from sources for yourself (unless there are unofficial binaries out there).
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