the small button with "s" on the gear stick is for turning on 'sports' mode. when in D (drive) position . if you push this button there will be a "S" on the meter with the D written . that means sports mode is on. in this mode the car can pick very fast and RPMs are high when you throttle and in this mode eco mode will not be on. basically car will be like sports car sort of with a lot of fuel consumption .. push the button again and sports mode will be off.
the small button on top is when the car is off , but you want to move the stick to a different postion other than P , like in neutral if needed. you push the button and then you can manually move the stick to any position