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It is up to you to keep your profile up to date.
Always make sure your email address is current.
You can change every field except your username in the profile.
Once you register your username, it is yours for life.
In exceptional circumstances, depending on your settings, you can change your user name yourself or you must ask the administrator to change your user name.
But you should give a good reason.
The User Control Panel can be accessed from your profile picture.