Username or EmailPassword
.... my usual user name is "Jed" and I had to put the extra "d" in there because you would not allow 3 characters. Very stupid that. Everything else is okay tho.
If you want to game the system a bit, you can use the username
[space]Jed using a space before the name. it doesn't seem to allow the use of a space after the name, but apparently you can use one before it.