Activating the debugger from the Development Environment is a simple matter of clicking on Debug | Start Debugging (or Shift + Ctrl + F5). The initial page that displays when the debugger is activated will look as follows (typically, with each session having a different User ID).
When we click on Start Debugging, an empty debugger page will open, awaiting the event that will cause a break in processing and the subsequent display of code detail (Variables), watched variables (Watches), and the Call Stack: