Press "start" to start your time. If you want to stop or pause it, press "stop". If you only press "stop", it will save your progress. If you want to start again from 0, press "reset". Your time is in the little orange square. Enjoy!
If you would believe it or not, my inspiration actually was from my teacher, my language arts teacher. Its cause she has a timer she uses, and I thought, "If she has a timer, how bout a stop watch?" And that's how I came up with this.