Use the Font dialog box to specify font attributes for titles and for series labels, which appear in the legend.
Font -- Select the name of the font to use, such as Serif or San Serif.
Size -- Select the font size, in points.
Style -- Select style attributes, such as bold, italic, or underlined. You can use these styles together or separately. If you specify no style, then the text will be plain.
Text Color -- Select a color for the text.
Alignment -- Select the alignment that you want for the text.
Actual font size -- Select this box to show the actual font size in the example. Deselect this box to display a default size that is convenient for viewing. This option does not affect the actual font size of the labels or titles.