From what I just red it means I can't get MERIT except when someone share it to me right?
You are right about that. Also, make sure that you are not buying any merit. It is easy to spot such behavior and you may get negative trust for this.
The challenge is how well you can make your post as constructive or helpful to others. Well, it's difficult to earn merits now and for those people who are making their posts as constructive as they can but can't really earn merits. All that there is to it is to improve their communication skills and knowledge. This forum will surely help them develop those skills as they will be earning points little by little.