Site Logo requires the Jetpack plugin.
The Site Logo is a perfect method for adding some branding to your website. Just upload an image, and it will display in the appropriate place in your theme.
Site Logo functionality requires the Jetpack plugin. Just install and enable the plugin and you will be able to upload a logo through the Customizer.
Sometimes if you have a Site Logo then you won't need the Site Title and Description. If that's the case then above the Site Logo selection tools in the Customizer, you will see a checkbox labelled Display Header Text. To hide your site title and description, leaving just the logo, uncheck this box. Be sure to click Save to make it active on your site.
We'd love to get some feedback to help us create better themes.