I have been into the system for some months now and I have made over twenty posts but no simply merit has been given to me or earn by me and this make me to be surprise on how these merit are generated, given or earned. However, looking at it in another perspective, I don't know if it is because I did not meet the number of my post require to earn a merit or because of the low quality of my post that is the reason why I had not been able to earn a single merit. So please I will like to get more clarifications on the possible requirement for earning merit.
Actually there is no minimum or maximum post requirement to earn merit. If you can create good quality posts that contain information people can learn from and are very informative then you will have merit there. Maybe you posted a lot but those posts were not informative enough due to which you didn't get merit there. If you create good posts from now you will surely earn merit.
But remember to make good posts you must put in a lot of effort and spend a lot of time in the forum. If you can give your best effort then I think you might be able to earn merit. One more thing you can notice here is that those who are getting more merit can remember how they are making posts. You will definitely be able to earn merit if you create good quality posts by watching and learning from them.