Open  Customize > Theme Options > Site Identity.

Logo
Use this setting to add a logo to your site. Your logo will appear just above the site title.

Site Title
Use this setting to configure your site’s title. If you do not want to show the site title along with your logo, uncheck the “Display Site Title and Tagline” setting.

Tagline
Use this setting to configure your site’s tagline.

Display Site Title and Tagline
Uncheck this option to hide the site title and tagline. This is useful when you’d like to add a logo which already includes the name of your website.

Site Icon
Use this setting to add a site icon.