good thing OP that you were still earning some merits. You have made some effort on this post. One thing that when you present an idea to a certain topic must be complete. You know that OP that you are missing many things here. Like how to apply a signature campaign is part of when you join a signature campaign. Another thing is how to provide payment address like ETH address by providing link to it. So completely this is an incomplete guide on how to join signature campaign.