Board Game Arena

I'm not asking about the rules. I understand the rules. I know that you have stop on the side of the road. How do you do it in the app? What am I supposed to click on to actually send the car to the pits?

I understand the rules for pit stops, but how do you actually use them in the game/app? I can't find any buttons to press to allow me to use it. I'll be wrecked on the side of the road with 00 and not on a special spot. But I can't figure out how to send my car to the pits. I've only played solo so ...