No Kaboom,
I dunno who put that in there. YOU CANNOT USE SF TO CHANGE WHICH UNIT IS PLACED FIRST. Yes that means delete everything and place that unit first!
Use SCMIE
http://www.staredit.net/index.php?download=363to save the units and to put them back in after putting that unit first
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Oh I though he meant how to change the units players when he wants to pre-place the.
Like you place 1 marine for player 1 and you don't know how to place a marine for player 2.