What's in a Name? Display Name, Username or First/Last Name?
Originally I thought "Your name" meant just my First Name, (or Full Name), instead of "Username"...
This might be bad for common names like "Chris" or "John"...
If "Your name" is "Username" ... then maybe there should be other fields for "First Name"... "Last Name"... etc.
Not sure, maybe there should be a "Display Name" field that doesn't have to be unique.
Either way "Your Name" is confusing...
Also I didn't notice the error "User Quang already used" at first and got confused as to why I couldn't change my Name, If it was red it might be more noticeable.