I'm basing the process on the below, since there is no link for "forgot password" on the website:
https://intercom.help/safedice/account-security/ive-lostforgotten-my-password-how-can-i-recover-it

Problem is that nobody is responding to chat, forum or emails. 

In my case, the transfer was from changelly, so I don't have private keys to sign the msg, so only thing to do is to screenshare my changelly account and show the transaction.