Site identity
You can change your site’s identity from Appearance → Customize → Global, under the Site Identity section.
Upload your main logo from the Logo field. The logo replaces the site title in the header.
To add a retina (high-resolution) logo, use the Logo (Retina) field. Retina logos should be exactly twice the width and height of the standard logo.
Site title and tagline
Section titled “Site title and tagline”The Site Title and Tagline appear when no logo is set, and are used by search engines. Change them from the corresponding fields.
Site icon
Section titled “Site icon”The Site Icon (also called a favicon) is the small icon that appears in browser tabs. Upload a square image, at least 512 × 512 pixels.