Find an BTC address posted by the account. Sign a message to confirm ownership. To do so, read this thread: https://bitcointalk.org/index.php?topic=703657.0. Optionally post it here and I will neg. rate the account until recovered.
what address, where? I never posted any BTC addresses here.
Then you're likely out of luck. You have to provide sufficient proof that you are the original owner of the account kiffner.