If you want advice on your own case, it's best to open your own topic and include the exact wording from your RFE. Unless your wording is exactly the same, the responses here will not be helpful. I didn't read the topic back then, but before advising I would have asked more questions. It seems this petition was rejected altogether, not just a request for evidence. Either way, signing page 12 was not the issue. That page is only signed by a "preparer" not the petitioner. If something else, or a signature was missing, it was not about page 12.