3. Entering Data
To enter data into a worksheet, a cell must first be
selected. A selected cell is outlined in black (or
possible other colors). For example below, the cell A1
is selected and ready for data entry :

If data is typed it can be entered into cell A1 only.
Try entering your name in cell A1. Notice that your
name also appears on the edit line. This is where data
is edited if changes need to made. Remember, for
information to be entered, you must follow the data
with enter (
), or an arrow key, or by clicking the
mouse in another cell. Try editing your name. Select
cell A1 and click the mouse on the edit line near the
information you want to change. Use del or Backspace
to delete items.
Numbers are entered in the same manner. A number will
become a label (a non integer entry) if used in
combination with letters. Try entering a number into
cell B1.