[Suicide Junkie]

You can't change a race setup for a game that has already started.

You can change the EMP by:
1) start a new game
2) "add existing empire" (an .EMP file)
3) edit the empire
4) "Save empire" (to an .EMP)

The only way to change the techs a race gets during the game is to change the mod. (IE. edit racialtraits.txt, components.txt, etc, and swap one racial tech for another)