Cannot turn off hazards on 1990 Buick Reatta
Are you pushing the button to turn them off? if so then the button must be jammed.It should be a black square button with a red triangle on it.
This indicates that there is an issue with the electric connection on the reatta. You also need to check the wiring on the fuse panel. It would be best to seek the guidance of a mechanic for other possible causes and for the car to be fixed.
You could just for tonight remove the fuse that supplies them so you won't have a dead battery, then consult a technician tomorrow.