you must make every day at least 1 posts and after 14 day you will gain 14 activity. when your activity reaches 30, you rank will change to jn.member and then you can join signature campaign, but be careful and make good quality posts, or they willnot let you to join campaign
AFAIK you get max 14 Activity/week. Activity is calculated by using the posts number, and the time you've spent on this forum. So the more time you spend here & the more posts you write, the easier your rank will grow up. To earn from signature campaigns, all you have to do is to go to a thread about one and follow the rules (usually on the 1st post of the thread). There are some even for Newbies, you can start from small earnings and then earn more and more each rank.
Activity will increased 14 in 2 weeks, not in a week. Lol. Better you learning first about bitcoin OP, after that, you can starting to post your comment in this forum.