Changing your public name
To change the public name shown in Trello, log into your Atlassian account at https://id.atlassian.com/ and then go to https://id.atlassian.com/manage-profile/profile-and-visibility to change your public name. The changes will then also be available within Trello:
Using a legacy Trello account? If you would like to change the username associated with your account, go to
https://trello.com/my/profile, find the Username field. Enter your new username in that field and click Save. You can only change your username to a name that is not in use by another user
