Should I have to apply for signature campaign or I have to acquire more knowledge by improving my posts and rank as well.
There are some projects/ICOs that are accepting jr members.
What are the responsibilities/tasks that have to be done after joining signature campaign
Yes a Jr. member may join a signature campaign, but there are also a few campaigns that even newbie can join. It has a campaign of 10-15 posts per week atleast 70 characters upwards and its content should be meaningful, when a project is successful you will be paid. Be careful and research about things in bitcoin when you avoid any mistakes.
From where can we usually find signature campaign? I am a newbie and much willing to learn more about everything here in bitcoin and as much as possible try not to post unrelevant posts or replies. For now I am only reading and learning from everyone's replies so I could get ideas.