see p73 +Adding and Editing Table Cell Values+ of the
Numbers09_UserGuide.pdf downloadable from under the Help Menu.
" *Adding and Editing Table Cell Values*
You can add, change, and delete the content in cells.
*Here are ways to add and edit values:*
• If the cell is empty, select it and then type a value. “ Selecting a Table Cell” on page 51 describes how to select cells.
• To replace specific content already in the cell, select the cell and then select what you want to replace by double-clicking; hold down the Shift key and select more content if you want to replace more. Type to replace the selected content.
•To replace everything in the cell, select the cell and then begin typing.
If “Return key moves to next cell” isn’t selected in the Table inspector, you can also
select the cell and then press Return or Enter, which selects everything in the cell, and
then start typing. "