#1 Download a .torrent file (contains "instructions" for BitTorrent how to download that particular file).
#2 You should automatically get a pop-up asking for a location where BitTorrent should save the files - choose someplace with enough space.
#3 Wait and wait and wait for your file to download.

Sarf
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I must not fear. Fear is the mind-killer. Fear is the little death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain.