You cannot change your username because it's what uniquely identifies you on DU Poetry. It would be confusing for other members if this changed (and could be open to abuse).
You can however change your "real name", this appears alongside your username throughout the site. To edit your "real name" you need to navigate to "My Home" in "My DU" and choose "Edit Profile".
Added: 24th August 2013 8:56pm
Last modified: 12th January 2016 2:38pm