It is difficult to catch the desirable unrecognized word with Rickaichan. How to fix it?

Question:

I am using Rikaichan on Firefox. However, it is difficult to catch the desirable unrecognized word with Rickaichan. How to fix it?

Answer:

What do you mean it is difficult to catch? From my 2 weeks experience of using Rikaichan, you just have to move your mouse and move it until you find the meaning that makes sense. If after this I can't get a word with satisfying meaning, I just move on to the next word.