Some say you should expect it to fail. The problem is that the idea isn't new or untested. This idea has actually been around for decades. Before smart phone apps, the sound was emitted from plug-in or battery-powered electronic devices. You can still buy these by the way. Even radio stations have tried to broadcast the sound. In all, these have been tested many times, and they failed. Sometimes, they even attract more mosquitoes.
But if you still want to give it a try, the app comes with two screens. One shows a picture of a mosquito and an 'on' button with the word 'inactive' describing the current status of the app. You simply press the button, the app emits a buzzing sound, draws a red circle with a bar across the mosquito, and changes the message to 'emitting ultrasonic sound.'
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