How would you download files from with Speed Download? It's a download-manager for Mac(s), but I don't know how to use it with

There's a video of the latest version of Speed Download ( being used in a tutorial: Link to Video

Would any of you please tell me how to make it the default download-manager on a Mac OS X PPC? The Speed Download (version: application doesn't download the files from the url's listed on Rapidshare, unless I use the Safari-browser and drag ".zip"-files & ".rar"-files to Speed Download.

If any of you would give me step-by-step instructions to get files to download from Rapidshare to Speed Download, rather than my web-browser's default download-manager, I'd appreciate your lesson or advice.

Thanks for your time & reading about my situation.