To add a favicon to your website, open Site app and proceed to “Settings” screen.
To upload a favicon in this section, use an ICO format file.
To create am ICO file, use a special online service or a graphic editor with ICO format support.
Here you can also upload an iOS favicon in PNG format.
Upon uploading, save the settings and check how the favicon appears in different browsers.
If you cannot see your favicon, this might be caused by your browser cache or the use of an supported image format. Be sure to save your favicon file in ICO format and to check its appearance in different browsers, with their cached cleared. Note that browsers may not update information about favicons within several hours after a new icon file had been uploaded.