The Mobile App is currently in development. However, the information on the page you sent are correct and can be used. You can connect to your LED Saber using the nRF Connect App (available for Androiid and iOS), and use the information on this page to change color or pattern in real time. You will know your Saber is connected to your phone when its light will turn blue.
When the Mobile App will be ready, we will first release it to Beta Testers, and then to the standard App stores.