Pretty straightforward. Also, you do not need tunestor, but it is best to use it if you want to get it directly into iTunes. If you don't want it to go directly to iTunes, when you right click the link, just chose save link as or something like that. BTW, if you have firefox, i recommend DownThemAll download accelorator. just go to http://www.addons.mozilla.org
and search for downthemall.
you also do NOT need the program, just right click the mp3 link and do save as... or save link as...
Step 1: (optional) Visit http://www.tunestor.com
and download tunestor. Go to where you downloaded it to and install it