Go to https://id.atlassian.com and edit the profile (your avatar at the top right, manage account and then click on each field that you want to change.
It may take a few hours to propagate changes to some systems, so give it a while before checking if it worked
@Nic Brough _Adaptavist_ I've followed your direction and when I am there I can only change my name but there is no place to replace my @user. There is no place the shows my @user name anywhere so I don't see where this is accounted for. I did change my name to see if it affected it and it still shows my @user name from a long ago which I would like to shed. Any additional suggestions?
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