Changing default player

So I've got this map set up with the units I want the computer to have as Player 1 (Red) and the units I want the human player to have as Player 2 (Blue). Problem is I can't make the human player start as anyone but Red. I hope there's something really minor that I'm overlooking here (I'm a total noob, duh) and it doesn't mean that single-player maps *have* to have the human player as Red.

Any help appreciated. Thanks!

Scenario -> player properties.

Where is says "Controller" and says "user", change it.

Any players set to "user" can be controlled by a human player.

If you don't want anyone (computer or human) to use player red, set it to none.

That was the first thing I tried. I set player 1 to computer, player 2 to user, and player 4 to rescuable. When I start up the map, though, I have control of player 1's units and player 2 is computer-controlled.

Lock player properties (its on the forces tab of the same window.)