Newbie question?

I am trying to make a single player map and i am confuesed.
I set blue player as human and user control. Then placed a town hall and blue starting point over it but wc still makes it random race and puts main building in every starting point. what must i do? :(

Go to Force settings, check use custom forces and then also check the other square, the name is something like Lock Player settings...that means you can't choose in the game. If you want a normal town hall then don't change anything, just remove the building u placed but if you want another building check the triggers and remove the trigger that places the start building.

thanks custom forces and lock worked.