To preview and apply styles, Quickly Formatting Text and Paragraphs
Click the paragraph or select the text to which you want to apply a style. Then on the Home tab, in the Styles group, click the thumbnail of the style you want to apply in the Quick Styles gallery.
To change the style set, Manually Changing the Look of Characters
On the Home tab, in the Styles group, click the Change Styles button, click Style Set, and then click the set you want to use.
To apply character formatting, Manually Changing the ...