During the step-by-step procedure of creating your chart you will find the Legend Box page of the Create New Chart dialog box A window used to supply information to Publisher..
If you are editing an existing chart A pictorial representation of information from a table eg a graph., double-click on the chart to display the Edit Chart Properties dialog box and select the Legend Box tab.
From the Paragraph Style drop-down list box, select the paragraph style The name for a particular type of paragraph with its own set of features, for example, font, alignment, bullets and indents. you want to use for the legend box text.
From the Font drop-down list box, select a font for the legend box text.
From the Point Size drop-down list box, select the size you want the legend box text to be.
Check the Bold check box to make the text bold.
Check the Italic text box to make the text italic.
Check the Underline text box to have the text underlined.
Note:
You can see the effect of the changes you make in the display box.