could the software you used not find the correct password by bruteforcing or don’t you know how to use them?
Have you a specific question? There are many tutorials available tutoring how to use program xy to brute a pass-protected rar-file.
In addition to being more specific about what the RAR cracker is (or isn’t doing) could you be a little more specific about what your end goal is here? There aren’t many reasons to “ethically” crack a RAR password (I can think of only a few). I’m not in to helping people break the law. Seeing how it is your first post and all….