How To Replace Favicon

You need to add it before the </head> attribute in the header.php file, eg:
<link rel="icon" type="image/png" href="https://example.com/myicon.png">

Create a child theme (https://codex.www.ads-software.com/Child_Themes) instead of changing the original theme code.

Or you could just use a plugin, see https://www.ads-software.com/extend/plugins/search.php?q=favicon

Thank you Brad. It is working now at [Unnecessary link moderated]

David