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I created a Stack Overflow account using my Gmail account. I would now like to change the username. Is this possible? If so, how?
I am leaving this here since I actually went through the effort of answering the question
Click on your username at the top of the page. Just to the left of the gray user-information area, you will see a link to 'edit'. There you can change your username.
The details in the UI may have changed a bit since the previous answers were posted, but they're still mostly right.