When pressing Umbrafy, Umbra will generate an object in your scene called "Umbra Runtime". The runtime object gets configured automatically by Umbra. The object can also be created directly from the Umbra-menu by clicking "Create Runtime"
In order to explore the content, you will need a camera script. You can use this basic script for that purpose, however it is provided as is and with no guarantees. Import it into the project and the drag it on top of Main Camera.
Use the mouse to pan around the scene and WASD-keys on your keyboard to move around. Q to move down, E to move up.
Runtime Inspector Settings
The Umbra Runtime gets configured automatically, and should look like this. To learn more about the Runtime-settings, please see the Umbra Runtime-section.