We don't allow users to change their name whenever they want, username changes are very confusing for other users, imagine if your friends changed their names every few weeks! If you want a username change it can be requested by contacting an administrator for now and we'll consider it (although almost always users are allowed just one name change), if you do have the option to change your name the page does show up, it's just hidden by default Thanks for the feedback!
Just a suggestion.
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