Locate the text style you want to change via the Quick Style gallery:
Quick Styles are found on the Home tab in the Styles group.
To modify the style:
- Select the style, right-click then click Modify…
The Modify Style dialog box appears. This is where you’ll make your changes.
- Use the drop-down arrows under the Formatting section to change the font, size, attribute (bold, italic, or underline), and colour.
- Click the drop-down arrow on the Format button for more options …
- … make your changes, and click the OK button.