Afaik you need to be a member at least to have a signature so you won't be able to join a campaign until then.
No, Jr member is the minimum rank that allows a signature; newbies were allowed to wear signatures before the
enhanced newbie restrictions & requirements.
However most signature campaigns only take from full member up and a few allow member rank.
I want to be associated with the signature camerapain in the forum. I don't know how to be. Someone help me with this.
This forum is not a means of earning simply, it's rather a discussion forum for engaging with individuals who have an interest in Bitcoin. Judging from your post history, you've simply been spamming bounties, as that is probably not profitable, you wish to switch to signature campaigns.
Rather than look for how to earn, take out time to read and interact with other members, through this you'll gain more knowledge and as a bonus, a possible spot in a campaign.