I'm going to assume that you're running in Windows with Microsoft Visual Studio.
All you need to do is right click on your files in the solution editor and "remove" those files from the solution. Then right click on the "Source Files" folder, highlight "Add" and open the file from the new location.
When computerquip asked you about your enviornment he was asking what operating system (windows, MacOS, Linux) you are running and which IDE (Visual Studio, CodeBlocks, MinGW, gcc, etc.) you are using to build your program.