You can move the camera with the arrow keys and move the angle of the camera with 2, 4, 6 and 8 (the arrows of the - numpad). You can also select a camera by clicking on the + numpad), or you can do a drag-and-drop like (click on the + mouse to grap the scene, and move the mouse to rotate the + camera). You can also select a camera by clicking on the red part of it, and get back to the free camera by clicking again. You can also select a camera by simply clicking on the object you want to see. The program will choose the - camera that you want. + camera that you want, and move to it progressively.