"Split Stereo Track" from the Track Drop-Down Menu

I have both the latest version and an older version 1.3 Beta but neither of them have this option so why is it listed here. http://forum.audacityteam.org/posting.php?mode=post&f=46 It’s something I need to do urgently as I have downloaded and re-installed both versions today. I have noise when I record on one channel so if I can seperate and delete one channel, I can record my voice cleanly. Until I can do this no podcasts

Click on the track name to make the “drop down menu” appear:
See also: http://manual.audacityteam.org/o/man/track_drop_down_menu.html
for details of the menu items.