Hi,
At the moment, I cannot test Visual Studio 2012 because I still have a very old computer.
In the meantime, please build fuzzylite from console as it is described in http://fuzzylite.com/cpp and then create a Console project, where you will have to correctly set up the Include Path, Library Path and Linked Library options to point to fuzzylite.
Please, make sure that you revise the solutions in other posts: