WordPress fetches this avatar automatically from your Gravatar.com profile which is WordPress default service for avatars. This avatar will be shown inside your author widget, comments section…basically wherever your WordPress theme allows you to display it.
- Solution 1: Register to Gravatar.com with the same email you are using for specific user on your website and that’s it.
- Solution 2: You can use some plugin which will allow you to upload your custom image instead of registering to gravatar.com. For example: https://wordpress.org/plugins/wp-user-avatar/