Facing little bit trouble to find the sign message. Do you have any idea which signature code need to required? How can I fill it?
That section is meant to
verify messages signed by other users with bitcoin addresses. The signature is the generated string that is needed to verify that a message signed using a bitcoin address was in fact legit.
I don't use the wallet on blockchain.info, but poke around and see if you can find a section labeled "Sign Message" or something similar. It's probably near where the Verify Message tool is.