If the particular address is a part of your blockchain.info HD wallet, follow these steps, otherwise ignore it.

(You must have your Recovery phrase/Seed before proceeding)

First, You must get it's private key

Download this and run it offline: https://github.com/iancoleman/bip39. Paste your seed there and you will see your address/es and its corresponding private keys at the "Derived Addresses" section. To toggle between accounts, Change the number on the "account" field where 0 is your default account, it means your 2nd account will be "1" and the 3rd will be "2" and so on.. (Use Ctrl+F to easily find the address you want)

Lastly, Download this and run it offline: https://github.com/OrdinaryDude/offline-bitcoin-signer. Paste the private key, enter your message and hit "Sign"

P.S. I tested this and verified the signature through coinig