1. What is activity
2. What is merit
3. What is the criteria of rank system
I have seen many threads but no one has explained it in easy ways.
So these are the most common problems for the newbies.
And the one most important thing that how are we gonna earn from here???
^This aren't really important if you are just here to learn about Bitcoin itself. Essentially you only need to reach the Jr. Member rank to get all the features needed (image being shown in your post) and it just takes 6 weeks and a merit for you to be ranked a Jr. Member. I wouldn't really worry about this at all since they aren't really related to Bitcoin itself but rather the forum's ranking system. If I were you I'll just start reading thread and try to learn and be part of that conversation so that you could start learning.