Understand your concerns Neelam about not getting RSB.I never got it earlier. I don't do job posting, don't have enough time to submit articles, although there are 4 half-written ones.
What I liked was the forum, I quickly scan the forum posts from everyone and then read the replies, this gives an idea of the question and the nature of the answers. If you are good at it, you can write a couple of paragraphs that get us around 5 points.
Posting a thread also gives you 5 points, here once I get an idea from the net or the papers, I quickly make a note in notepad and then develop this. I learnt by reading the author's title and the thread content, it gives an idea who to generate a good thread.
Articles by others are good and informative, you can add on or comment if you read it carefully and write replies to get some points.
I have been observing Ask the expert section closely and the accuracy of the replies, the ones I'm comfortable, I start to reply.
This month luckily I had some leave days in between and I have been utilising it as I'm not sure about next month. So, I mean use free time to visit often and try contributing to almost all threads, even 3-4 lines are OK.
Good luck, the others have given very good ideas.