That thread you linked to requires a high level of computer literacy to participate. I don't want to learn how to sign messages, all I want is something fast and simple I can do to help me recover my account if its hacked.
You actually don't need to sign a message, just post it there and it will be your proof that you own both the account and address when the address is quoted. Either way, if your account is hacked, you will need to learn how to sign a message in order to prove that they account is yours.