If you go back to the animation section again and select the 'Light' tab, you can press the 'Add light' button to add a light to the scene. You can choose between directional, spot and point lights. If you are lighting an indoor environment like this you should limit yourself to spotlights and point lights. After adding and moving some lights, you can press F4 to go back to the object section and calculate the new light maps. In the actual end result that can be downloaded we've added the "walkthrough" QuickStart template to create a simpel walkthrough demo.