Try following the getting started instructions for Bluetooth LE devices: http://www.espruino.com/Quick+Start+BLE
If you're on Windows 7 you need to install the native Web IDE
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Try following the getting started instructions for Bluetooth LE devices: http://www.espruino.com/Quick+Start+BLE
If you're on Windows 7 you need to install the native Web IDE