If you are using WordPress 4.3, then you can add favicon from the WordPress admin area. For that, you need to go to the “Appearances.” After that, you will see the customize option. So, you must click on it. It will show you the “Site identity” tab. So, you must click on it. The Site identity section allows the user to change many things, such as site title and description. Moreover, it allows you to control the display items in the header. And it also allows you to upload an icon.