Abhik, thanks for your kind answer.
Tested it and it works.. for those that bhave a signature active. In message area doesn't look good.
But I've got a new idea, a new place.. just I don't know what's the name of the file in the template for that place. Look, I want it displayed there, near Reply to Thread... it will fit perfectly! See the image beyond:
Waiting for a response. Thanks again!