Are you trying to edit the username while logged in as your standard account, or as the admin account?
Also, if the username in question is linked to an active directory profile it cannot be modified on your end. It will need to be modified via active directory.
Roshan, So find the user in user management. Click the username, bringing up the users profile. On the far right there should be an Actions dropdown. Select this, and select Edit details. If there is no "Actions" drop down you are either not logged into your admin account or its an ldap user. I hope this helps!
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