To earn easy merit you shoul post and reply a great message or reply. Be constructive. Answer the thread more seriously. Put some effort in it. Then if they notice you reply and liked it. Then thats the time they will give merit to that reply of yours. Very easy but so hard to achieve. Trust me mate. Be constructive. Youll get there. If not well, i guess i was wrong. But im very positive that youll get it. And have many merits.