Since 2014, the username is your email.
Yes, but that isn't used/displayed in the forums (logon/validation only), that is the Display Name.
What "
-midnight" is talking about is the user name:
How can I change it? I don't know why I chose -midnight.
Thank you in advance for any replies
She is inadvertently talking about the Display Name.
As Secondmineboy mention:
How can I change it? I don't know why I chose -midnight.
<snip>
U can change it under Profile>User account
My guess, is he has interpreted (correctly) what -midnight wants as changing what is displayed alongside posts.