Upload a favicon and/or set a site title via the Site Administration section. Select Admin on your Global Navigation bar (the wrench icon), and then follow these steps:
Favicon
1. Select a file from your local machine (i.e., computer). The image should be relatively square for the best resolution.
2. Upload the file.
Site Title
1. Enter a site title.
2. Click the Save Site Title button.
The favicon and site title appear on the browser tab when the site is open on a user's device: