It is likely that you will not want to keep the randomly generated username and icon that Chrome has chosen for you. In the example above, Google has chosen the name Spandex for my new user. I'd like to hope that I can come up with a better name for myself.
To modify the name and icon, first return to the Personal Stuff Preferences page by following steps 2 and 3 of this tutorial. Next, highlight the username that you wish to edit by clicking on it. Once selected, click on the Edit… button.