i have read that...
but which address should i put? i dont have bitcoin address on that account,,, should i use a random address? but,,, why should i send a signed message? it is not fair for my privacy
How else are you planning to prove that you are the real owner of that account ? I could say I'm the owner too and how exactly would you believe me ?
If you have your personal data which can be used to prove your identity then we can verify that but since anonymity is a huge concern for people here,signed messages are a way to go.