When using a function, you can enter the cells manually or by selecting them. Thus, to add up the four numbers that we added above (A2, A3, A4, A5), do this:
- Type an equals sign = in an empty cell.
- Type sum or select it from the function list f(x).
- Select the cells to be added together. The formula should be something like =sum<A2:A5>.
- Press the Enter key or click the green tick (checkmark) on the Formula Bar.
- The answer appears in the cell you have selected.