To boot into the operating system instead of auto-starting Signagelive when installed as a kiosk application, you will need a keyboard and mouse, and then will need to follow these steps:
Power off the device and plug in the keyboard and mouse.
Power the device back on and after a few seconds, the machine will start to initialise Signagelive.
Press Ctrl+Alt+S to stop Signagelive auto-starting and to boot in the operating system instead.