In order to rank up you will be needing to acquire minimum 10 merits to become a Member Rank. Regarding how to get merits there are various ways to acquire it. You can post quality articles that might help other members here in the forum, you can also try to report some merit abuser or bounty farming. I suggest you must stay and be observant about the forum and when you have enough knowledge maybe then you can answer and help other people here who are in need.