Archive gives you a choice of FLAC, OGG Vorbis, or MP3. Get the
MP3 since it is the only one compatible with iTunes (and almost all other players too).
At Archive, the underlined file size is the download link. The easiest way is to right-click it, choose Save Link As, and let it download to your computer.
Once it is on your machine, drag in into the open iTunes window, which will cause iTunes to add it to your library.
There is tons of good stuff there. Let us know how it goes.