On the main page of the application, there are three different buttons - Play, Instructions, and Options.
Pressing this button will bring you to the "Instructions" page. This page explains how to use the application, appropriate seating when you use the application, how to contact Serious Tree LLC with questions and support, and frequently asked questions.
There is also a YouTube video created by Serious Tree showing how to use the application. There are also others on their website showing the application in use.