Right-click the text to be altered and choose Font from the menu that appears. Alternatively, select a single text element and then choose Text Font from the Format menu.
Click the arrowhead next to the font name and choose a new font style from the list displayed. Some fonts allow styles such as bold, italic etc. Where available, these can be selected on the right side of the dialogue box. A sample of the current selection appears below.
Click OK to complete the change.