This YTS screencast covers the editing of your WordPress profile name, as well as the creation and use of a Gravatar (Globally Recognized Avatar), an image that can appear adjacent to your profile name in a blog post or comment.
Using your real first and last name with your photo helps to establish your online identity. Your online voice of authenticity and by extension, your influence, can also be enhanced.
For more, see the official documentation from WordPress: WordPress.org on the Users/Your Profile Screen; WordPress.com User Profile; WordPress.com and Gravatars. And see the Gravatar site.
Noobs 2: Ask questions about anything related to this screencast in the forum here.