You can "contact" him on email: safedice@protonmail.ch or visit his bitcointalk profile here and send PM: https://bitcointalk.org/index.php?action=profile;u=396610
By the way all I can wish you is luck, a lot of people who are waiting for withdrawals were left without any answer from admin, seems he no longer cares much.
Always wanted to ask, anyone knows why Tor based website uses cloudflare?