Apply preset paragraph styles in Keynote for iCloud

A paragraph style is a set of text attributes—like the font, text size, and color—that determines how the text in a paragraph looks. Most themes include predesigned paragraph styles that you can use to to achieve a consistent look for different types of text. For example, apply the Title style to all your slide titles and Body style for the slide contents, so the text looks consistent throughout your presentation.

Go to Keynote for iCloud , then sign in to your Apple Account (if necessary).
In your presentation, select one or more paragraphs, or click anywhere in a paragraph to apply a style to only that paragraph.
In the Format sidebar on the right, click the Style button near the top.
Click the Paragraph Styles pop-up menu, then choose a style.

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Keynote User Guide for iCloud

Apply preset paragraph styles in Keynote for iCloud