The first part of that is requiring an image target in the scene:
- In the Project Assets/Vuforia/Prefabs folder there's a prefab named ImageTarget. Drag that into the Hierarchy.
- In the Inspector, in the Image Target Behavior component, locate the Type parameter. It may say No Targets Defined. Press the button to do the creation.
That will open your internet browser to the Vuforia Target Manager web page. This will allow us to use their software to create the target database.