Here is the link (as posted above) that shows exactly what to do:
https://bitcointalk.org/index.php?topic=5089777.0

Summarized. Mail from account's original email address to the mentioned address (recoveries...@bitcointalk.org).
Username and in this case also a signed message with an address posted in the past. If this is not possible then at least the mail with username and explanation what happened.

The team is certainly willing to help further