The square with the X is column 5 row 3.
Here is that graph paper again, now with more squares marked:
The position of each square is given by its column number and row number. For instance, the square with the # is column=1 row=5. The square with the $ is column=5 row=1. Notice that you have to be careful to get column and row in the right order.
What is the column and row of the square marked with ? ?