If you can't sign a bitcoin message, then you are not the real owner.
Well, I have forgotten the blockchains password since I do not use it anylonger. Both of my neg trust given are literaly stupid, non sense. Just wanted to clarify things, I am the real and only owner. Anyways thank you.
If you have access the the email account associated with the blockchain.info account you might have an email containing the secret passphrase for all your bitcoin addresses.