Based my thread in my local sub https://bitcointalk.org/index.php?topic=2946861.0, I'll make this thread more completly with this, especially how to make sign messages bitcoin address at blockchain.info wallet


Question : If there is already a thread about that, why did you created this thread man? Are you wanted to spam or something?! Go away!
Answer : No dear, certainly I'm not. I did this because Shorena still didn't give detail a tutorial on how to sign a message with new version blockchain wallet.
Lucky me, I've already tried it and it was successfully verified!
Step 1
Login to your blokchain wallet just as usual blockchain.info.
Make and copy your private key to notepad. Follow cissrawk tutorial on https://bitcointalk.org/index.php?topic=2107937

Step 2
After you got your private key, go to blockchain.info
choose menu ==> setting


Step 3
Choose address sub menu


Step 4
Click Import Bitcoin Address button


Step 5
Fill it with your private key, then click import


Step 6
After you've done succesfully don that, then your address will be shown just like in number (5), choose more option


Step 7
Choose sign message


Step 8
Make sure your adress and your message match with your account on bitcointalk, make sure to include the date when you sign it too


Step 9
If you've successfully done it, you will see something like this

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EDIT:
For some reason, I'm not suggest you to use blockchain.info as your main wallet.
This is just tutorial, how to make signature message at b.info wallet.