What are you trying to do? Edit the DNA of an existing proxy in dev mode? Use existing items in-game to change race? Create a new proxy from scratch? Hire a new proxy of a specific race from the Agency? Create a new item to change race, and add it to the game?
Right now, I believe the only in-game way to change race is to use the Kau Tangata potion from the Romuls quest. If you haven't started the quest yet, keep talking to Belanika at the farm outside of town.
Im trying to change it ingame with items or missions