You didn't help him even a bit with your answers.
You probably have a filesonic plugin that came with your rapidleech. You should go to your settings page on your rapidleech, then tick "Use premium account", and enter your premium account info. Then go back to the "Main window", and just paste the link you want to download. The script will automaticly detect that the site you're downloading from is FileSonic, so you won't need to do anything, a window will pop-up, showing your download progress. When it's finished, you'll be able to do loads of things with your file.