The Home screen shown below opens when you launch the app. The two large buttons in the middle of the screen give you access to the DRIVE screen and the SNAP EDITOR.
The Navigation Menu Bar can be accessed by pressing on the tab at the top-center of the screen. This bar provides a convenient navigation between the main screens of the app. The CONNECT button lets you initiate a connection to a train.
And when you are connected, the CONNECT button is replaced with a red button that lets you disconnect the train.