rapidminer expert needed

I tried to use rapidminer with my dataset but I don't think I did it correctly I want to train a classifier to help me automatically classify the Facebook comments into positive or negative. I have my software which can only detect which comments have insults or bad words. I just need a classifier to classify my comments into negative and positive. PLEASE PLACE BID IF YOU ARE EXPERT IN RAPIDMINER. sorry for capital words but need to show you what is important thing.thanks.