You can set the logo, the favicon and the app logo to your site.
On this page
For favicon and app icon you can use the following file formats to upload an icon:
The files size limit is 2.000.000 B.
Managing the logos
To set the logos for your site, go do Refined Administration > Look and Feel for the site.
In the Look and Feel tab of the site, upload the icons.
Site Logo and Favicon
The Site logo will be shown in the top of each page of the site, and the favicon will show up on the tab in the browser, making it easy for visitors to navigate in their browser.
The App Icon
The App icon will show up whenever a user adds a link on the home screen of their mobile device.