If you are a donating member there will be no problem , if not good luck , but yes as there is ssite upgrade I doubt that it will be a priority at the moment
As said only donating members can change their user name. Anyone who creates a second or subsequent account will trigger flags and the new account deleted .
To become a donation member you can use the link on the forum home page .
For me , if it a account user name or email user name , of course, , it relates to personal privacy on the iPhone , i have to ask some erase tool for help to erase data before i want to selling it ,