How to implement multithreading in C++?

Here is my 2D array of char:
. . . . .
. x . . y
. . . . .
. . z . .
. . . . .

The problem is i want make x, y, and z move independently in that 2D array of char and then show their move in CMD. How do i implement multithreading in this case?

Thanks before!