Please note the new forum software does not allow space in username, so during migration, all spaces are removed from username, for example, "Airport Data" will become "AirportData". You'll need to use correct username to log in.
However, the new software also has a nickname field, so if you want to have your full name shown, you can set nickname by clicking your username at top-right corner, then choose "Profile". In Profile page, at top-right corner, click "Control" then "Edit".
Ken