Applying a paragraph style to text makes it easy to change several attributes of the text—like its size and color—all at once, rather than making the changes individually.
Select one or more paragraphs, or click anywhere in a paragraph to apply the style to only that paragraph.
Click the paragraph style name at the top of the sidebar on the right, then choose a style from the Paragraph Styles pop-up menu.
If you don’t see a sidebar, or the sidebar doesn’t have text controls, click 
in the toolbar. If the text is in a text box, table, or shape, click the Text tab at the top of the sidebar.
If you later change the look of text that has a paragraph style applied to it—for example, you make the text bold or change its color—an asterisk, and in some cases an Update button, appears next to the style’s name in the Paragraph Styles pop-up menu, indicating that the style has an override. You can update the paragraph style to incorporate the overrides if you want.
Note: You can also apply list styles to lists.