To change the font attributes (style, size, color, etc.):
Select the cell(s) that you want to format.
Go to the Format menu, and click Cells.
Click the Font tab.
Here, you can:
Select a font (Arial, Book Antiqua, etc.) from the Font box.
Select a font style (Regular, Bold, Italic) from the Font style box.
Select a font size from the Size box. Or, type in a size of your own.
Under Effects, choose Strikeout and/or Underline.
Select a font color from the Color box.
When you are finished, click OK.
The formatting will be applied to the selected cell(s).
Note: To quickly access the font attributes window, go to the Format menu, and click Font and Color.
Font Formatting in Advanced Mode
To apply font formatting in Advanced Mode:
Select the cell(s) that you want to format.
Click a formatting icon:
Font, Size: Changes the font type or size within the selected cells.