Dont worry, this software will make it possible. Just simply :
1) Open the software and choose the rar file that you want to find the password of
2) Choose the type of attempt that software need to make and simply press START
Done, simple as.
This software tries all the possible answers and it check with every characters. The harder the password is, the longer it takes to find. So please be patient with that. No matter what, this program will find the password, even if it take a while .