If you want to change your default favicon, this is the right place. In this post, I'll show you how to change / add your favicon on your WordPress website.
A favicon is typically a graphic 16 x 16 pixels square and is saved as favicon.ico in the root directory of your server. You can use a favicon with any WordPress blog on a web server that allows access to the root directories.
Step 1: Go to your theme editor and select header or header.php
Step 2: Search for the line of code that contains favicon. Overwrite it, if it exists, or add the following code below the <head> HTML tag then save it.
<link rel="shortcut icon" href="<?php echo get_stylesheet_directory_uri(); ?>/favicon.ico" />
Step 3: upload your favicon.ico to your WordPress folder using either file manager or ftp client. Then check again by entering http://yourwebsitename.com/favicon.ico.
Step 4: Refresh your blog and the miracle will happen
Note: delete your browser's cache if you see no change.