To apply a function, you create a formula that uses that function. If you know the formula you want to use, you can type it directly into a worksheet cell, or into the Formula Bar (which displays the cell content in a larger space). If you’re uncertain about the specific function that will perform the calculation you want, or unsure about how to put together a formula using that function, you can call on the Formula Builder to help you put one together.
You can create a formula in any of these three ways:
Type the formula directly into the worksheet cell in which you want the results to appear.
Display the Formula Bar, and ...