I'm not sure if your saying you have unlocked the console or not, if not, you need to go here;
You must be registered to see the links
And grab the latest version, in each UE update features available tends to change, thus the need to constantly update.
That will unlock the console, and on game that support it (like this current build), add in a free cam. For games that don't support it (like the 1st release of this demo with fixed camera positions), then use the console for the debug camera.
Command without quotes is "ToggleDebugCamera" if nothing happens you'll need "EnableDebugCamera" first.