Apple Numbers '08 - Manual (Page 97)

Chapter 5 Using Formulas and Functions in Tables 97
To use the Function Browser to add a function:
1 Select the cell in which you want to add a function.
2 Click the Function Browser button in the Formula Bar, or choose Insert > Function >
More Functions. The Function Browser opens.
3 Select a function.
To find a function, scroll through the list on the right, optionally subdividing the list by
selecting a function category on the left. You can also search for a specific function
within the selected function category by using the search field in the upper right.
4 Click Insert.
The Formula Editor is displayed in the cell, with the selected function in the text field,
followed by one or more argument placeholders within parentheses.
5 Use the Formula Editor or Formula Bar to replace each placeholder with a cell reference
or other value or perform any additional formula editing required.