During sign-up I thought the 'username' slot would purely be log-in information and not my display name as well, and unfortunately there's no way to manually change one's username in the profile settings, so if a moderator could shoot me a private message for help with changing it, that'd be awesome. Thanks!
We would be happy to help you with your request. Community is a public forum and we strive to protect the privacy of our users. I will reach out to you through a case and will follow up about the username you would want to use for your Community account.